feat: extension support (#78)

ui/flutter/lib/app/modules/extension/bindings/extension_binding.dart

@@ -0,0 +1,12 @@
+import 'package:get/get.dart';
+
+import '../controllers/extension_controller.dart';
+
+class ExtensionBinding extends Bindings {
+  @override
+  void dependencies() {
+    Get.lazyPut<ExtensionController>(
+      () => ExtensionController(),
+    );
+  }
+}