message: Add: core `messageVerificationObjectValidator` mock
diff: @@ -13,3 +13,7 @@ export const transactionObjectValidator = jest.fn(
  export const messageObjectValidator = jest.fn(
  (messageObject = {}) => messageObject,
  );
  +
  +export const messageVerificationObjectValidator = jest.fn(
  + (signedMessageObject = {}) => signedMessageObject,
  +);
  