Cardano Updates

From https://github.com/IntersectMBO/plutus at 61b1eedf082050d89cde8db89d73aae65bc95a65

From https://github.com/IntersectMBO/plutus at 61b1eedf082050d89cde8db89d73aae65bc95a65

From https://github.com/IntersectMBO/plutus at 61b1eedf082050d89cde8db89d73aae65bc95a65

From https://github.com/IntersectMBO/plutus at 61b1eedf082050d89cde8db89d73aae65bc95a65

From https://github.com/IntersectMBO/plutus at 61b1eedf082050d89cde8db89d73aae65bc95a65

- /governance/committee: current committee snapshot with members, quorum,
  and source NewCommittee governance action (null for the Conway-genesis
  committee).
- /governance/committee/votes: paged history of all CC member votes.
- /governance/committee/{cc_id}/votes: paged votes filtered by CIP-129 hot
  or cold credential; cold queries aggregate across hot-key rotations.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Keep deposit only on per-event endpoints:
- /accounts/{stake_address}/registrations
- /governance/dreps/{drep_id}/updates

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Use of getTxBody in cardano-rpc/src/Cardano/Rpc/Server/Internal/UtxoRpc/Submit.hs
will be migrated to the experimental API in a follow-up. Suppress the
deprecation warning here to keep -Werror green, matching the approach used
for the internal cardano-api modules in the previous commit.

Add JSON serialisation instances for all types composing `Tx TopTx ShelleyEra`:
- `cardano-ledger-core`: `TxIn`, `TxId`, `Metadatum`, `WitVKey`,
  `BootstrapWitness`, `Addr`, `RewardAccount`, `ScriptHash` (ToJSONKey/FromJSONKey)
- `cardano-ledger-shelley`: `ShelleyTx`, `ShelleyTxBody`, `ShelleyTxWits`,
  `ShelleyTxAuxData`, `ShelleyTxOut`, `MultiSig`, `Update`, `ProposedPPUpdates`

Conventions followed:
- `kindObject` for sum types
- `ToKeyValuePairs` + `deriving via KeyValuePairs` for product types
- TxIn serialised as "TxIx#TxIx" text key
- Map fields serialised as JSON objects (not lists of pairs)

Add golden JSON test for `Tx TopTx ShelleyEra` at `eras/shelley/impl/golden/tx.json`.

Add JSON serialisation instances for all types composing `Tx TopTx MaryEra`:
- `AssetName`: `FromJSON` (hex text) and `FromJSONKey` in `Cardano.Ledger.Mary.Value`
- `MultiAsset`: `FromJSON` in `Cardano.Ledger.Mary.Value`
- `MaryValue`: `FromJSON` (`{"lovelace": N, "policies": {...}}`) in `Cardano.Ledger.Mary.Value`
- `TxBody TopTx MaryEra` in `Cardano.Ledger.Mary.TxBody`
- `Tx TopTx MaryEra` in `Cardano.Ledger.Mary.Tx` (via newtype delegation)

Add golden JSON test for `Tx TopTx MaryEra` at `eras/mary/impl/golden/tx.json`.

`goldenExampleEraTxCborSpec` allows us to generate a `Spec` for
generating a `golden/tx.cbor` golden file out of some `Tx` provided as a
parameter.

Then, for each era's test-suite, we call this function to generate the
golden file using the example transaction we have defined for each era.

We also extended `EraTest` so that we don't need to manually call
`getDataFileName` in order to get the fullpath for each era's cabal
project.

We also create new `Binary.Golden` modules for Mary and Babbage (previously
they reused Allegra's and Alonzo's respectively, which used the wrong era's
example transactions).

Additionally, fix `exampleDijkstraBasedTopTx` to not add PlutusV4 scripts
to `scriptTxWitsL`: PlutusV4 is not included in Dijkstra's
`transaction_witness_set` CDDL, so those scripts were
silently dropped during serialization, causing a roundtrip failure.

Signed-off-by: Chris Gianelloni <[email protected]>

This will use the correct package database

Deprecates the old-API transaction body surface (the type, its
constructor, and direct producers/consumers) so users are pointed at
'Cardano.Api.Experimental'. Internal modules that still use these
symbols are annotated with -Wno-deprecations to keep -Werror green;
they will be migrated in a follow-up along with the setter family.

Deprecations:
- TxBody (data type), ShelleyTxBody (constructor)
- TxBodyContent (type/constructor)
- createTransactionBody, defaultTxBodyContent
- getTxBody, getTxBodyContent
- BalancedTxBody

The existing pattern-synonym TxBody deprecation message is updated for
consistency with the new messages.