Split governance MIRTransferConstructor

[newhoggy]

Changelog

- description: |
    Split governance `MIRTransferConstructor`
    Add `babbage governance create-genesis-key-delegation-certificate`
# 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
  - improvement    # QoL changes e.g. refactoring
  # - 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 MIRTransferConstructor was previously shared between to commands. Split this constructor so that the constructor is no longer shared.

Add babbage governance create-genesis-key-delegation-certificate

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

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

[newhoggy]

I don't understand why reserves are matched to treasury and vice versa.

[carbolymer]

Last two arguments are pot and target. The pot is the source I guess. This would mean: from treasury and from reserves respectively as far as I understand.

[Jimbo4350]

It was confusingly named in ledger so TransferDirection was created to make it more obvious what was happening.