Better representation of minting values in the code

[carbolymer]

Changelog

- description: |
    Remove minting capabilities in eras prior to Mary.
    Change minted assets representation to `L.MultiAsset` instead of `Value`.
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
   - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

The minted amount was represented as Value which includes ADA. It was only guarded against "minting ada" in parser, not in the type. This PR changes the type to use ledger's L.MultiAsset, which contains only non-ADA assets.

Also the minting options are removed from eras before Mary.

Requires changes from to build successfully:

• Add missing CastVerificationKeyRole StakePoolExtendedKey StakePoolKey instance cardano-api#782
• Make 1-1 relationship of witness and policy ID in TxMintValue instead of 1-* cardano-api#776

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[Jimbo4350]

👍

[Jimbo4350]

You can parameterize pMintMultiAsset on MaryEraOnwards era, remove the Maybe from the type signature and call caseShelleyToAllegraOrMaryEraOnwards here instead. I think that is cleaner but I wouldn't block the PR on it.