fix: export bip322 types and utility functions

TICKET: COIN-5426

Author: bhavidhingra

modules/abstract-utxo/src/transaction/index.ts

@@ -3,3 +3,4 @@ export { explainTx } from './explainTransaction';
 export { parseTransaction } from './parseTransaction';
 export { verifyTransaction } from './verifyTransaction';
 export * from './fetchInputs';
+export * as bip322 from './bip322';