feat: add custom buttons for participant menu and toolbar via config (#12832)

* add custom remote menu button

* add config for custom buttons

* whitelist custom buttons flag

* add toolbox custom button

* fix notify toolbox buttons

* whitelist toolbar custom buttons

* rename and fix notify

* rename participant remote menu

* revert some flag wrong changes

* fix some formatings

* add undefined type to custom buttons toolbox

* code review

* code review 2

* fix linting issue

modules/API/API.js

@@ -1941,6 +1941,21 @@ class API {
         });
     }
 
+    /**
+     * Notify external application ( if API is enabled) that a participant menu button was clicked.
+     *
+     * @param {string} key - The key of the participant menu button.
+     * @param {string} participantId - The ID of the participant for with the participant menu button was clicked.
+     * @returns {void}
+     */
+    notifyParticipantMenuButtonClicked(key, participantId) {
+        this._sendEvent({
+            name: 'participant-menu-button-clicked',
+            key,
+            participantId
+        });
+    }
+
     /**
      * Disposes the allocated resources.
      *