Cardano Updates

Implement gov/constitution/v0 namespace

* Introduce utxo/v0 namespace for canonical ledger state

In this commit following changes were introduced:

- new utxo/v0 namespace for namespaces that reuses on-wire
types as much as possible.
- in order to use these type new OnChain wrapper was introduced
  this type allows keep value of the type and binary representation

For forward compatibility all era specific types are included in
the internal library of the cardano-ledger-canonical-state package.

* Apply suggestions from code review

Co-authored-by: Alexey Kuleshevich <[email protected]>

* Make code compile and simplify the structure.

As it was possible to abstract code and make it depend only on era
it was possible to remove era specific code. After this change
'cardano-ledger-canonical-state:conway' may only keep the instaces
for the era spefic types.

* Apply suggestions from code review

Co-authored-by: Alexey Kuleshevich <[email protected]>

* Address comments and further simplify code

* Remove redundant module

* Format cabal file

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Co-authored-by: Alexey Kuleshevich <[email protected]>