Add modX functions for all fields of TxBodyContent up to Babbage.

[locallycompact]

Changelog

- description: |
    Adds `modTxTotalCollateral`, `modTxReturnCollateral`, `modTxFee`, `modTxValidityLowerBound`, `modTxValidityUpperBound`, `modTxMetadata`, `modTxAuxScripts`, `modTxWithdrawals`, `modTxCertificates`, `modTxUpdateProposal`, `modTxScriptValidity`, `modTxMintValue` functions for modifying `TxBodyContent`. Adds `addTxMintValue` and `subtractTxMintValue`.
# 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

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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

[smelc]

Can you add documentation to this one? It seems to me one cannot guess what the implementation is doing just using the function name and the types involved.

[smelc]

@locallycompact> can I merge?

[locallycompact]

Yes please

[locallycompact]

Could we get a release with these in?