Make ScriptTransactionRequest.from clone a given transaction

[arboleya]

Currently, this utility method creates a new instance that references received object.

Quick example:

const base_tx: ScriptTransactionRequest = { .. }

const estimation_tx = ScriptTransactionRequest.from(base_transaction);

estimation_tx.inputs.push(...spendableInputs);

const final_tx = ScriptTransactionRequest.from(base_transaction)

final_tx.inputs.push(...otherSpendableInputs);

// Result: all base_tx, estimation_tx, and final_tx will contain `spendableInputs` and `otherSpendableInputs`

It should ideally clone the received transaction and return a new one, that doesn't reference anything.