Expose Byron CDDLs in Test.Cardano.Chain.Binary.Cddl

[jasagredo]

Description

This PR replicates the logic in Test.Cardano.Ledger.<ERA>.Binary.Cddl for exposing the cddl files.

Checklist

• Commits in meaningful sequence and with useful messages.
• Tests added or updated when needed.
• CHANGELOG.md files updated for packages with externally visible changes.
  NOTE: New section is never added with the code changes. (See RELEASING.md).
• Versions updated in .cabal and CHANGELOG.md files when necessary, according to the
  versioning process.
• Version bounds in .cabal files updated when necessary.
  NOTE: If bounds change in a cabal file, that package itself must have a version increase. (See RELEASING.md).
• Code formatted (use scripts/fourmolize.sh).
• Cabal files formatted (use scripts/cabal-format.sh).
• hie.yaml updated (use scripts/gen-hie.sh).
• Self-reviewed the diff.

[jasagredo]

I'm unsure if this deserves changelog entries and/or version bumps

[teodanciu]

I think the changelog and version are not problem, but I'm a little unsure about all the consequences of moving the files. It will, at least, break the link on the README: https://github.com/intersectmbo/cardano-ledger/tree/master/eras/byron/cddl-spec/byron.cddl

[jasagredo]

I updated all links I could find to the Byron cddls.

[lehins]

Beautiful! Thank you! 🙂

[jasagredo]

Should I click merge or is it better if I let someone from @IntersectMBO/cardano-ledger-maintainers do it instead?

[lehins]

As long as it is approved and CI is passing, there is no reason why it can't be merged 😉