Cardano Updates

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.

Introduced instances for the simplest of the blocks.

This commit defines a new library where the main definitions persist.
In the library there will be definitions for the era angostic types.

As blocks/v0 is common for all eras, it doesn't cripple into the
era libraries.