More exhaustive golden tests for Node-to-Client queries

[amesgen]

Currently, we have golden tests for some, but not all queries (both the encoded query and result messages):

ouroboros-consensus/ouroboros-consensus-cardano/src/shelley-testlib/Test/Consensus/Shelley/Examples.hs

Lines 199 to 217 in 15d2e93

	queries = labelled [
	("GetLedgerTip", SomeSecond GetLedgerTip)
	, ("GetEpochNo", SomeSecond GetEpochNo)
	, ("GetCurrentPParams", SomeSecond GetCurrentPParams)
	, ("GetProposedPParamsUpdates", SomeSecond GetProposedPParamsUpdates)
	, ("GetStakeDistribution", SomeSecond GetStakeDistribution)
	, ("GetNonMyopicMemberRewards", SomeSecond $ GetNonMyopicMemberRewards sleRewardsCredentials)
	, ("GetGenesisConfig", SomeSecond GetGenesisConfig)
	]
	results = labelled [
	("LedgerTip", SomeResult GetLedgerTip (blockPoint blk))
	, ("EpochNo", SomeResult GetEpochNo 10)
	, ("EmptyPParams", SomeResult GetCurrentPParams srePParams)
	, ("ProposedPParamsUpdates", SomeResult GetProposedPParamsUpdates sreProposedPPUpdates)
	, ("StakeDistribution", SomeResult GetStakeDistribution srePoolDistr)
	, ("NonMyopicMemberRewards", SomeResult (GetNonMyopicMemberRewards Set.empty)
	(NonMyopicMemberRewards $ sreNonMyopicRewards))
	, ("GenesisConfig", SomeResult GetGenesisConfig (compactGenesis sreShelleyGenesis))
	]

The goal of this ticket is to extend this:

• Add golden tests for all queries, which also includes adding necessary examples for ledger types to Ledger.
• Make sure that the existing examples are sufficiently interesting; e.g. the example PoolDistr used for GetStakeDistribution has only one entry, which means that we couldn't notice that a recent Ledger update changed the encoding for maps with more than 23 elements.
• Add regressions specific to PR Make Conway query constructors ill-typed in pre-Conway eras #922: check that Conway queries are decoder failures for era before Conway.