fix(striker-ui): relocate Message(s) types

striker-ui/components/MessageGroup.tsx

@@ -170,6 +170,6 @@ const MessageGroup = forwardRef<
 MessageGroup.defaultProps = MESSAGE_GROUP_DEFAULT_PROPS;
 MessageGroup.displayName = 'MessageGroup';
 
-export type { MessageGroupForwardedRefContent, Messages };
+export type { MessageGroupForwardedRefContent };
 
 export default MessageGroup;

striker-ui/types/Message.d.ts

@@ -0,0 +1,5 @@
+type Message = import('../components/MessageBox').Message;
+
+type Messages = {
+  [messageKey: string]: Message;
+};