feat(customization): new customization service api (#4688)

extensions/default/src/CustomizableContextMenu/index.ts

@@ -1,11 +1,5 @@
 import ContextMenuController from './ContextMenuController';
 import * as ContextMenuItemsBuilder from './ContextMenuItemsBuilder';
-import defaultContextMenu from './defaultContextMenu';
 import * as CustomizableContextMenuTypes from './types';
 
-export {
-  ContextMenuController,
-  CustomizableContextMenuTypes,
-  ContextMenuItemsBuilder,
-  defaultContextMenu,
-};
+export { ContextMenuController, CustomizableContextMenuTypes, ContextMenuItemsBuilder };