feat(service-worker): Add typing for messagesClicked in SwPush service (#25860)

- Properly type messagesClicked Observable stream
- Add new NotificationObject interface

PR Close #25860

packages/service-worker/src/low_level.ts

@@ -52,6 +52,10 @@ interface StatusEvent {
   error?: string;
 }
 
+export interface NotificationObject extends NotificationOptions {
+  title: string; 
+}
+
 
 function errorObservable(message: string): Observable<any> {
   return defer(() => throwError(new Error(message)));