Export friendly function that returns ByteString + export buildShelleyAddress

[smelc]

Changelog

- description: |
    Export friendly function that returns ByteString + export buildShelleyAddress
# 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

• Continuation of https://github.com/IntersectMBO/cardano-cli/pull/745
• Required for updating input-output-hk/cardano-faucet to cardano-cli 8.22.0.0 and cardano-api 8.44.0.0

How to trust this PR

• Look at the prototype of friendlyBS, notice it plays well with the newly exported *Impl functions

Checklist

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