Show vote delegation in stake-address-info

[carlhammann]

Changelog

- description: |
    add the vote delegateee to the output of `stake-address-info`
# 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

This PR closes #423.

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

[carlhammann]

With last Friday's integration work on the node, this should now be usable with current main cardano-node. I'm therefore opening this for review. I'll release a new version of the cardano-api and revert 77bbc9d before merging; that should also solve the CI failures.