Upgrade to flutter_rust_bridge V2

lib/common/rust/api/downloader_api.dart

@@ -0,0 +1,24 @@
+// This file is automatically generated, so please do not edit it.
+// Generated by `flutter_rust_bridge`@ 2.0.0-dev.23.
+
+// ignore_for_file: invalid_use_of_internal_member, unused_import, unnecessary_import
+
+import '../downloader.dart';
+import '../frb_generated.dart';
+import 'package:flutter_rust_bridge/flutter_rust_bridge_for_generated.dart';
+
+Stream<DownloadCallbackData> startDownload(
+        {required String url,
+        required String savePath,
+        required String fileName,
+        required int connectionCount,
+        dynamic hint}) =>
+    RustLib.instance.api.startDownload(
+        url: url,
+        savePath: savePath,
+        fileName: fileName,
+        connectionCount: connectionCount,
+        hint: hint);
+
+Future<void> cancelDownload({required String id, dynamic hint}) =>
+    RustLib.instance.api.cancelDownload(id: id, hint: hint);