refactor(downloader): remove opts parameter from Resolve (#1595)

ui/flutter/lib/api/model/patch_task.dart

@@ -0,0 +1,16 @@
+import 'options.dart';
+import 'request.dart';
+
+class PatchTask {
+  final Request? req;
+  final Options? opts;
+
+  PatchTask({this.req, this.opts});
+
+  factory PatchTask.fromJson(Map<String, dynamic> json) => PatchTask(
+    req: json['req'] == null ? null : Request.fromJson(json['req'] as Map<String, dynamic>),
+    opts: json['opts'] == null ? null : Options.fromJson(json['opts'] as Map<String, dynamic>),
+  );
+
+  Map<String, dynamic> toJson() => {'req': req?.toJson(), 'opts': opts?.toJson()};
+}