Remove redundant voting and proposal procedures functions. Update cardano-api.

[carbolymer]

Changelog

- description: |
    Remove redundant voting and proposal procedures functions.
    Update cardano-api-9.2.0.0.
# 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

This PR is stacked on top of:

• Use IsList(toList,fromList) instead of specialised functions #865

This PR should be reviewed on commit-by-commit basis.

This PR introduces additional minor refactoring:

• Replace usage of L.Coin with Lovelace type alias and a pattern synonym
• Replace usages of ListMap.toList and ListMap.fromList with IsList(toList, fromList).

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]

LGTM but let's just use the Coin constructor.