ITxBuildArgs needs to support all (relevant) js native types

[michele-nuzzi]

In ITxBuildArgs

currently some interfaces do not support native js types, and strictly require classes

one example is ITxBuildInput

where the utxo field is of type IUTxO.

This looks good at first, but in reality the definition of IUTxO in cardano-ledger-ts uses ITxOut for the resolved field.

And the definition of ITxOut uses either Hash32 class or Data (from plutus-data)

in this case we should add support for strings and Uint8Array.

Many other cases going through ITxBuildArgs