Feature/1974 market framework

[EVODelavega]

Closes #1974 Adding opening auction definition to the market framework.

Changes to market framework and some parts of the API:

Market data will have 2 additional fields, and a new market proposal gets a new field, too.

These fields currently aren't required, to make it easier on everyone to make the required changes

[jeremyletang]

I think a bunch of convert functions will be missing in the graphql package for the fields / message you introduced in proto.

[edd]

Could you label the ticket this closes in the description?

[edd]

Nice docs work in this PR 👍

[vega-ci-bot]

system-tests failed.

=== Test summary ===
../../grpcTesting/devnet/sanityTests.py ......                           [100%]
../../grpcTesting/governance/newMarketGovTests.py EEEEEEEEEEEEEEEEEEEEEx [ 47%]
EEEEEEEEEEEEEEEEEEEEEEEE                                                 [100%]
 ERROR at setup of testVoteNDecline 
 ERROR at setup of testVoteYEnactedFail 
 ERROR at setup of testVoteYNProposalDraw 
 ERROR at setup of testVoteYYNProposalPass 
 ERROR at setup of testNewMarketRejectNoStake 
 ERROR at setup of testNewMarketValidProposal 
 ERROR at setup of testGetAllProposals 
 ERROR at setup of testGetAllOfTheProposals[6] 
 ERROR at setup of testGetNewMarketProposals[6] 
 ERROR at setup of testGetAllOfTheProposals[2] 
 ERROR at setup of testGetNewMarketProposals[2] 
 ERROR at setup of testGetAllOfTheProposals[5] 
 ERROR at setup of testGetNewMarketProposals[5] 
 ERROR at setup of testGetAllOfTheProposals[4] 
 ERROR at setup of testGetNewMarketProposals[4] 
 ERROR at setup of testGetAllOfTheProposals[3] 
 ERROR at setup of testGetNewMarketProposals[3] 
 ERROR at setup of testGetProposalsByParty 
 ERROR at setup of testGetRejectedProposalsByParty 
 ERROR at setup of testGetOpenProposalsByParty 
 ERROR at setup of testGetVotesByParty 
 ERROR at setup of testNewMarketOpenSingleTok 
 ERROR at setup of testVoteYSmallHolder 
 ERROR at setup of testVoteYMediumNSmallHolder 
 ERROR at setup of testVoteTopUpSmallDuringVote 
 ERROR at setup of testVoteYNNoFundsProposal 
 ERROR at setup of testNewMarketInvalidParty 
 ERROR at setup of testInvalidEnactTime 
 ERROR at setup of testVoteYOwnOpenProposal 
 ERROR at setup of testVoteYOpenProposal 
 ERROR at setup of testVoteNOpenProposal 
 ERROR at setup of testVoteNoStakeOpenProposal 
 ERROR at setup of testVoteNoStakeAddFunds 
 ERROR at setup of testVoteRejectProposal 
 ERROR at setup of testVotePassedProposal 
 ERROR at setup of testVoteBothYNOpen 
 ERROR at setup of testVoteTwiceYSameUser 
 ERROR at setup of testVoteInvalidProposalID 
 ERROR at setup of testVoteEnactedMarket 
 ERROR at setup of testVoteDeclinedMarket 
 ERROR at setup of testVoteYTaintedKey 
 ERROR at setup of testNewMarketClosedProposal 
 ERROR at setup of testSubmitEnactedGTCOrder 
 ERROR at setup of testSubmitUnEnactedMarketGTCOrder 
 ERROR at setup of testFiftyYesVoteProposal 
../../grpcTesting/governance/newMarketTradesTests.py ......FF.F..        [100%]
 testCloseOutTraderBuyOrders 
 testCloseOutTraderSellOrders 
 testTradeGTTToIOC 
../../grpcTesting/margins/marginsTests.py ..                             [100%]
../../grpcTesting/markets/marketsTests.py ..............                 [100%]
../../grpcTesting/orders/amendOrdersTests.py ........................... [ 87%]
....                                                                     [100%]
../../grpcTesting/orders/cancelOrdersTests.py .......................    [100%]
../../grpcTesting/orders/generalOrdersTests.py .............             [100%]
../../grpcTesting/orders/limitOrdersTests.py ...........                 [100%]
../../grpcTesting/orders/marketOrdersTests.py ........                   [100%]
../../grpcTesting/orders/mixedOrdersTests.py .....................       [100%]
../../grpcTesting/orders/negativeOrdersTests.py ........................ [ 57%]
....x.........s...                                                       [100%]
../../grpcTesting/parallel/submitParallelOrdersTests.py ........         [100%]
../../grpcTesting/parties/partiesTests.py ..                             [100%]
../../grpcTesting/trading/positionsTests.py ..                           [100%]
../../grpcTesting/trading/tradesTests.py ......FF.F..                    [100%]
 testCloseOutTraderBuyOrders 
 testCloseOutTraderSellOrders 
 testTradeGTTToIOC 
../../grpcTesting/wallet/walletTests.py ................................ [ 76%]
..........                                                               [100%]
../../rest/orders/negativeOrdersTests.py .                               [100%]