Add reset tunnel option on ios

lib/singbox/service/ffi_singbox_service.dart

@@ -224,6 +224,13 @@ class FFISingboxService with InfraLogger implements SingboxService {
     );
   }
 
+  @override
+  TaskEither<String, Unit> resetTunnel() {
+    throw UnimplementedError(
+      "reset tunnel function unavailable on platform",
+    );
+  }
+
   @override
   Stream<SingboxStatus> watchStatus() => _status;