feat(notifications) trigger iframe api event when a notification occurs (#12952)

* feat(notifications) trigger iframe api event when a notification occurs

* remove useless comment

* fix typo

modules/API/API.js

@@ -1229,6 +1229,22 @@ class API {
         });
     }
 
+    /**
+     * Notify the external app that a notification has been triggered.
+     *
+     * @param {string} title - The notification title.
+     * @param {string} description - The notification description.
+     *
+     * @returns {void}
+     */
+    notifyNotificationTriggered(title: string, description: string) {
+        this._sendEvent({
+            description,
+            name: 'notification-triggered',
+            title
+        });
+    }
+
     /**
      * Notify external application that the video quality setting has changed.
      *