chore(sdk-core): allow messages for prebuild tx whitelist

BTC-2417

TICKET: BTC-2417

Author: davidkaplanbitgo

modules/sdk-core/src/bitgo/wallet/iWallet.ts

@@ -121,6 +121,7 @@ export interface PrebuildTransactionOptions {
    * */
   senderWalletId?: string;
 
+  messages?: { address: string; message: string }[];
   changeAddress?: string;
   allowExternalChangeAddress?: boolean;
   type?: string;