Cardano Updates

* Create .gitattributes

following advice here: to override stupid, incorrect Linguist determination that our 99.9% Markdown code is >50% Python.

* Delete .gitattributes

* add .gitattributes to only count Markdown files

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

toLedgerDatum was incorrectly converting TxOutSupplementalDatum to
L.Datum (inline representation). Per the Alonzo ledger spec,
supplemental datums should produce L.DatumHash on the output, with
the full datum data going into TxDats separately.

Also updates fromLegacyTxOut to return supplemental datum data
alongside the TxOut, so callers can populate txSupplementalDatums.
Adds supplementalDatumFromLegacy helper for this purpose.

Document the architectural decision to replace the legacy
TxBodyContent build era type with a simplified TxBodyContent era
that uses ledger types directly, eliminates the build phantom
parameter, and integrates with the ADR-010 witness API.

Bumps [github.com/blinklabs-io/plutigo](https://github.com/blinklabs-io/plutigo) from 0.0.23 to 0.0.24.
- [Release notes](https://github.com/blinklabs-io/plutigo/releases)
- [Commits](https://github.com/blinklabs-io/plutigo/compare/v0.0.23...v0.0.24)

---
updated-dependencies:
- dependency-name: github.com/blinklabs-io/plutigo
  dependency-version: 0.0.24
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Signed-off-by: Tripura Repalle <[email protected]>

Port block generation infrastructure from cardano-wallet as library code
(useful for downstream consumers for benchmarks and integration tests).

New library modules:
- Block.Gen: era dispatcher (mkBlockEra)
- Block.Gen.BlockParameters: input record type
- Block.Gen.Shelley: TPraos blocks (Shelley/Allegra/Mary/Alonzo)
- Block.Gen.Babbage: Praos blocks (Babbage/Conway)
- Block.Gen.Byron: Byron blocks

New test module with 35 tests (7 eras × 5 tests each):
- fromConsensusBlock/toConsensusBlock roundtrip
- getEraBlockNo, getEraSlotNo accessors
- getEraTransactions count
- getEraHeaderHash not bottom

Closes #5

Add changelog item for o-c

This is to allow sublibrary syntax.

Signed-off-by: Eric Torreborre <[email protected]>

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