feat: create v1beta2 gov proto types (cosmos#10589)

## Description

Ref: cosmos#9810

Bumps gov proto files to v1beta2 and creates new `Proposal` type

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

proto/cosmos/gov/v1beta2/genesis.proto

@@ -0,0 +1,26 @@
+syntax = "proto3";
+
+package cosmos.gov.v1beta2;
+
+import "gogoproto/gogo.proto";
+import "cosmos/gov/v1beta2/gov.proto";
+
+option go_package = "github.com/cosmos/cosmos-sdk/x/gov/types";
+
+// GenesisState defines the gov module's genesis state.
+message GenesisState {
+  // starting_proposal_id is the ID of the starting proposal.
+  uint64 starting_proposal_id = 1 [(gogoproto.moretags) = "yaml:\"starting_proposal_id\""];
+  // deposits defines all the deposits present at genesis.
+  repeated Deposit deposits = 2 [(gogoproto.castrepeated) = "Deposits", (gogoproto.nullable) = false];
+  // votes defines all the votes present at genesis.
+  repeated Vote votes = 3 [(gogoproto.castrepeated) = "Votes", (gogoproto.nullable) = false];
+  // proposals defines all the proposals present at genesis.
+  repeated Proposal proposals = 4 [(gogoproto.castrepeated) = "Proposals", (gogoproto.nullable) = false];
+  // params defines all the paramaters of related to deposit.
+  DepositParams deposit_params = 5 [(gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"deposit_params\""];
+  // params defines all the paramaters of related to voting.
+  VotingParams voting_params = 6 [(gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"voting_params\""];
+  // params defines all the paramaters of related to tally.
+  TallyParams tally_params = 7 [(gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"tally_params\""];
+}

proto/cosmos/gov/v1beta2/gov.proto

@@ -0,0 +1,191 @@
+syntax = "proto3";
+package cosmos.gov.v1beta2;
+
+import "cosmos/base/v1beta1/coin.proto";
+import "gogoproto/gogo.proto";
+import "google/protobuf/timestamp.proto";
+import "google/protobuf/any.proto";
+import "google/protobuf/duration.proto";
+import "cosmos_proto/cosmos.proto";
+
+option go_package                       = "github.com/cosmos/cosmos-sdk/x/gov/types";
+option (gogoproto.goproto_stringer_all) = false;
+option (gogoproto.stringer_all)         = false;
+option (gogoproto.goproto_getters_all)  = false;
+
+// VoteOption enumerates the valid vote options for a given governance proposal.
+enum VoteOption {
+  option (gogoproto.goproto_enum_prefix) = false;
+
+  // VOTE_OPTION_UNSPECIFIED defines a no-op vote option.
+  VOTE_OPTION_UNSPECIFIED = 0 [(gogoproto.enumvalue_customname) = "OptionEmpty"];
+  // VOTE_OPTION_YES defines a yes vote option.
+  VOTE_OPTION_YES = 1 [(gogoproto.enumvalue_customname) = "OptionYes"];
+  // VOTE_OPTION_ABSTAIN defines an abstain vote option.
+  VOTE_OPTION_ABSTAIN = 2 [(gogoproto.enumvalue_customname) = "OptionAbstain"];
+  // VOTE_OPTION_NO defines a no vote option.
+  VOTE_OPTION_NO = 3 [(gogoproto.enumvalue_customname) = "OptionNo"];
+  // VOTE_OPTION_NO_WITH_VETO defines a no with veto vote option.
+  VOTE_OPTION_NO_WITH_VETO = 4 [(gogoproto.enumvalue_customname) = "OptionNoWithVeto"];
+}
+
+// WeightedVoteOption defines a unit of vote for vote split.
+message WeightedVoteOption {
+  VoteOption option = 1;
+  string     weight = 2 [
+    (cosmos_proto.scalar)  = "cosmos.Dec",
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
+    (gogoproto.nullable)   = false
+  ];
+}
+
+// Deposit defines an amount deposited by an account address to an active
+// proposal.
+message Deposit {
+  option (gogoproto.goproto_getters) = false;
+  option (gogoproto.equal)           = false;
+
+  uint64   proposal_id                     = 1;
+  string   depositor                       = 2 [(cosmos_proto.scalar) = "cosmos.AddressString"];
+  repeated cosmos.base.v1beta1.Coin amount = 3
+      [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];
+}
+
+// Proposal defines the core field members of a governance proposal.
+message Proposal {
+  option (gogoproto.equal) = true;
+
+  uint64   proposal_id                  = 1 [(gogoproto.jsontag) = "id", (gogoproto.moretags) = "yaml:\"id\""];
+  repeated google.protobuf.Any messages = 2;
+  ProposalStatus               status   = 3 [(gogoproto.moretags) = "yaml:\"proposal_status\""];
+  TallyResult                  final_tally_result = 4
+      [(gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"final_tally_result\""];
+  google.protobuf.Timestamp submit_time = 5
+      [(gogoproto.stdtime) = true, (gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"submit_time\""];
+  google.protobuf.Timestamp deposit_end_time = 6
+      [(gogoproto.stdtime) = true, (gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"deposit_end_time\""];
+  repeated cosmos.base.v1beta1.Coin total_deposit = 7 [
+    (gogoproto.nullable)     = false,
+    (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins",
+    (gogoproto.moretags)     = "yaml:\"total_deposit\""
+  ];
+  google.protobuf.Timestamp voting_start_time = 8
+      [(gogoproto.stdtime) = true, (gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"voting_start_time\""];
+  google.protobuf.Timestamp voting_end_time = 9
+      [(gogoproto.stdtime) = true, (gogoproto.nullable) = false, (gogoproto.moretags) = "yaml:\"voting_end_time\""];
+}
+
+// ProposalStatus enumerates the valid statuses of a proposal.
+enum ProposalStatus {
+  option (gogoproto.goproto_enum_prefix) = false;
+
+  // PROPOSAL_STATUS_UNSPECIFIED defines the default propopsal status.
+  PROPOSAL_STATUS_UNSPECIFIED = 0 [(gogoproto.enumvalue_customname) = "StatusNil"];
+  // PROPOSAL_STATUS_DEPOSIT_PERIOD defines a proposal status during the deposit
+  // period.
+  PROPOSAL_STATUS_DEPOSIT_PERIOD = 1 [(gogoproto.enumvalue_customname) = "StatusDepositPeriod"];
+  // PROPOSAL_STATUS_VOTING_PERIOD defines a proposal status during the voting
+  // period.
+  PROPOSAL_STATUS_VOTING_PERIOD = 2 [(gogoproto.enumvalue_customname) = "StatusVotingPeriod"];
+  // PROPOSAL_STATUS_PASSED defines a proposal status of a proposal that has
+  // passed.
+  PROPOSAL_STATUS_PASSED = 3 [(gogoproto.enumvalue_customname) = "StatusPassed"];
+  // PROPOSAL_STATUS_REJECTED defines a proposal status of a proposal that has
+  // been rejected.
+  PROPOSAL_STATUS_REJECTED = 4 [(gogoproto.enumvalue_customname) = "StatusRejected"];
+  // PROPOSAL_STATUS_FAILED defines a proposal status of a proposal that has
+  // failed.
+  PROPOSAL_STATUS_FAILED = 5 [(gogoproto.enumvalue_customname) = "StatusFailed"];
+}
+
+// TallyResult defines a standard tally for a governance proposal.
+message TallyResult {
+  option (gogoproto.equal) = true;
+
+  string yes = 1 [
+    (cosmos_proto.scalar)  = "cosmos.Int",
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable)   = false
+  ];
+  string abstain = 2 [
+    (cosmos_proto.scalar)  = "cosmos.Int",
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable)   = false
+  ];
+  string no = 3 [
+    (cosmos_proto.scalar)  = "cosmos.Int",
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable)   = false
+  ];
+  string no_with_veto = 4 [
+    (cosmos_proto.scalar)  = "cosmos.Int",
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable)   = false
+  ];
+}
+
+// Vote defines a vote on a governance proposal.
+// A Vote consists of a proposal ID, the voter, and the vote option.
+message Vote {
+  option (gogoproto.goproto_stringer) = false;
+  option (gogoproto.equal)            = false;
+
+  uint64 proposal_id = 1;
+  string voter       = 2 [(cosmos_proto.scalar) = "cosmos.AddressString"];
+  // Deprecated: Prefer to use `options` instead. This field is set in queries
+  // if and only if `len(options) == 1` and that option has weight 1. In all
+  // other cases, this field will default to VOTE_OPTION_UNSPECIFIED.
+  VoteOption                  option  = 3 [deprecated = true];
+  repeated WeightedVoteOption options = 4 [(gogoproto.nullable) = false];
+}
+
+// DepositParams defines the params for deposits on governance proposals.
+message DepositParams {
+  //  Minimum deposit for a proposal to enter voting period.
+  repeated cosmos.base.v1beta1.Coin min_deposit = 1 [
+    (gogoproto.nullable)     = false,
+    (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins",
+    (gogoproto.jsontag)      = "min_deposit,omitempty"
+  ];
+
+  //  Maximum period for Atom holders to deposit on a proposal. Initial value: 2
+  //  months.
+  google.protobuf.Duration max_deposit_period = 2 [
+    (gogoproto.nullable)    = false,
+    (gogoproto.stdduration) = true,
+    (gogoproto.jsontag)     = "max_deposit_period,omitempty"
+  ];
+}
+
+// VotingParams defines the params for voting on governance proposals.
+message VotingParams {
+  //  Length of the voting period.
+  google.protobuf.Duration voting_period = 1
+      [(gogoproto.nullable) = false, (gogoproto.stdduration) = true, (gogoproto.jsontag) = "voting_period,omitempty"];
+}
+
+// TallyParams defines the params for tallying votes on governance proposals.
+message TallyParams {
+  //  Minimum percentage of total stake needed to vote for a result to be
+  //  considered valid.
+  bytes quorum = 1 [
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
+    (gogoproto.nullable)   = false,
+    (gogoproto.jsontag)    = "quorum,omitempty"
+  ];
+
+  //  Minimum proportion of Yes votes for proposal to pass. Default value: 0.5.
+  bytes threshold = 2 [
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
+    (gogoproto.nullable)   = false,
+    (gogoproto.jsontag)    = "threshold,omitempty"
+  ];
+
+  //  Minimum value of Veto votes to Total votes ratio for proposal to be
+  //  vetoed. Default value: 1/3.
+  bytes veto_threshold = 3 [
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
+    (gogoproto.nullable)   = false,
+    (gogoproto.jsontag)    = "veto_threshold,omitempty"
+  ];
+}