Save transaction CBOR

This allows JS clients to efficiently build TxOutput via [TransactionOutput.fromCbor](https://github.com/input-output-hk/cardano-js-sdk/blob/master/packages/core/src/Serialization/TransactionBody/TransactionOutput.ts#L104) from cardano-sdk

Example of it used in Blaze https://github.com/butaneprotocol/blaze-cardano/blob/main/packages/blaze-query/src/maestro.ts#L158-L160