Start using huddle for defining cddl

[lehins]

Initial step will be defining alternative CDDL specification for all eras using huddle

Once specification is written using huddle we can release cuddle to Hackage.

The original CDDL will be used as a source of truth for a while until we are confident we can 100% rely on huddle to generate readable and accurate CDDL specification.

[Soupstraw]

We need to make cuddle compile with the GHC versions that we're using in cardano-ledger before we can tackle this task

see input-output-hk/cuddle#22