feat: emit raise hand event to external API (#8312)

* Expose raise hand event to external application

* Fix linting issues

* fix the app non existing issue

modules/API/API.js

@@ -1022,6 +1022,21 @@ class API {
         });
     }
 
+    /**
+     * Notify external application (if API is enabled) that user updated their hand raised.
+     *
+     * @param {string} id - User id.
+     * @param {boolean} handRaised - Whether user has raised hand.
+     * @returns {void}
+     */
+    notifyRaiseHandUpdated(id: string, handRaised: boolean) {
+        this._sendEvent({
+            name: 'raise-hand-updated',
+            handRaised,
+            id
+        });
+    }
+
     /**
      * Disposes the allocated resources.
      *