Conway Genesis additions

[teodanciu]

Description

Closes #3652

• Adds two fields to ConwayGenesis: Constitution and Committee
• Updates Conway Translation to create EnactState using the two new fields from ConwayGenesis
• Also added a trivial JSON gold test, to prevent accidental changes of the json serialization

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• When applicable, versions are updated in .cabal and CHANGELOG.md files according to the
  versioning process.
• The version bounds in .cabal files for all affected packages are updated. If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• All visible changes are prepended to the latest section of a CHANGELOG.md for the affected packages. New section is never added with the code changes. (See RELEASING.md)
• Code is formatted with fourmolu (use scripts/fourmolize.sh)
• Cabal files are formatted (use scripts/cabal-format.sh)
• hie.yaml has been updated (use scripts/gen-hie.sh)
• Self-reviewed the diff

[lehins]

Good work. Couple of common mistakes, but all easily fixable

[teodanciu]

Wow, it seems I don't understand at all how to use Crypto, EraCrypto, Era, ConwayEra in a correct way (the fact that it compiles is not sufficient for that)!
I will try to deduce from your corrections, @lehins , thank you!

[lehins]

Beautiful!