tx-generator: remove usage of cardano-api's ProtocolParameters (WIP)

[smelc]

Note

On top of #6087 and needs also to be merged after #6068 (to have more recent cardano-api version)

Description

This PR adapts tx-generator to the removal of the ProtocolParameters type from cardano-api (which has been deprecated, see IntersectMBO/cardano-api#384).

Instead this PR makes tx-generator use the ledger type PParams era directly. The challenge is that this type is parameterized by the era, as opposed to ProtocolParameters (that was hiding it).

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. These may include:
  • golden tests
  • property tests
  • roundtrip tests
  • integration tests
    See Runnings tests for more details
• CI passes. See note on CI. The following CI checks are required:
  • Code is linted with hlint. See .github/workflows/check-hlint.yml to get the hlint version
  • Code is formatted with stylish-haskell. See .github/workflows/stylish-haskell.yml to get the stylish-haskell version
  • Code builds on Linux, MacOS and Windows for ghc-8.10.7 and ghc-9.2.7
• Self-reviewed the diff