Authz support (delegator claim bug)

[bryanchriswhite]

Background

It seems that when authz actions happen differently than their vanilla counterparts.

It looks like the nested messages may still be encoded with protobuf, in which case we will need to decode them in the handler.

Example authz message body (see investigation-query.gql):

{
  "grantee": "fetch1m5hgzum68rjf4c7zhezgkj8hlnmr0kgh9uj0g8",
  "msgs": [
    {
      "typeUrl": "/cosmos.distribution.v1beta1.MsgWithdrawDelegatorReward",
      "value": {
        "0": 10,
        "1": 44,
        "2": 102,
        ...
    }
  },
  {
    "typeUrl": "/cosmos.staking.v1beta1.MsgDelegate",
    "value": {
      "0": 10,
      "1": 44,
      "2": 102,
      ...
    }
  ]
}

Acceptance Criteria

Handler exists for authz's MsgExec message which:

• checks that it's transaction was successful and bails if not
• decodes the message's Msgs and calls the primitive message handler, and any respective message handler function