TF-3996 Group context menu actions when opened email

lib/features/base/extensions/context_menu_action_list_extension.dart

@@ -0,0 +1,8 @@
+import 'package:core/presentation/extensions/iterable_extension.dart';
+import 'package:tmail_ui_user/features/base/widget/context_menu/context_menu_item_action.dart';
+
+extension ContextMenuActionListExt on List<ContextMenuItemAction> {
+  Map<int, List<ContextMenuItemAction>> groupByCategory() {
+    return groupBy<int>((action) => action.category, sortKeys: true);
+  }
+}