Support Conway HF ledger changes

[cffls]

Conway CDDL could found here.

[cffls]

Diffs between Conway and Babbage: https://www.diffchecker.com/jsg8YgK7/

Babbage: https://github.com/IntersectMBO/cardano-ledger/blob/139346b3879a2f7665a1453278d96170b1723796/eras/babbage/impl/cddl-files/babbage.cddl
Conway: https://github.com/IntersectMBO/cardano-ledger/blob/139346b3879a2f7665a1453278d96170b1723796/eras/conway/impl/cddl-files/conway.cddl