feat(cardano): add support for plutus transactions

[davidmisiak]

This PR adds support for Cardano Plutus transactions. Relevant firmware PR here.

There should be no breaking changes. New features (for details, see the updated docs):

• A new signing mode PLUTUS_TRANSACTION that is to be used with transactions involving Plutus script evaluation.
• New tx items collateralInputs and requiredSigners that can be used in PLUTUS_TRANSACTION.
• New tx item scriptDataHash and an output item datumHash which are used when attaching datums to a tx (when sending funds to a script address).
• Stake credentials in certificates and withdrawals may be given as keyHash in PLUTUS_TRANSACTION.
• The network id may be serialized into tx body by setting includeNetworkId: true.
• Minor fixes, e.g. a new value for testnet protocol magic.

[mroz22]

Hi, thanks for contribution. We are looking into it.

cc @slowbackspace

[mroz22]

all looks good. tests are green (sign tx failures with master firmwares are not related to this). keeping it open for a day or two, maybe somebody wants to add something here?