Export HasKeyRole's coerceKeyRole function

[smelc]

Changelog

- description: |
    Export HasKeyRole's coerceKeyRole function
# 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

• Required for https://github.com/IntersectMBO/cardano-cli/commits/smelc/augment-spo-stake-distribution/
  • This branch is for solving [FEATURE] - Update cardano-cli conway query spo-stake-distribution cardano-cli#911

How to trust this PR

It's only an additional export, and exporting a class name but not its functions was weird anyway.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• Self-reviewed the diff

[palas]

👍