Add test project adding assets in link

pkgs/native_assets_builder/test_data/add_dylib_link/.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/
+bin/add_dylib_link/

pkgs/native_assets_builder/test_data/add_dylib_link/README.md

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+This sample adds a native library in the link step.

pkgs/native_assets_builder/test_data/add_dylib_link/assets/test.txt

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+My test text

pkgs/native_assets_builder/test_data/add_dylib_link/bin/add_dylib_link.dart

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+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+void main(List<String> arguments) {
+  print(File('assets/test.txt').readAsStringSync());
+}

pkgs/native_assets_builder/test_data/add_dylib_link/hook/link.dart

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+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:native_assets_cli/native_assets_cli.dart';
+
+void main(List<String> arguments) async {
+  await link(arguments, (config, output) async {
+    output
+      ..addAsset(
+        DataAsset(
+          package: 'add_dylib_link',
+          name: 'test_text_file',
+          file: config.packageRoot.resolve('assets/test.txt'),
+        ),
+      )
+      ..addDependency(config.packageRoot.resolve('hook/link.dart'));
+  });
+}

pkgs/native_assets_builder/test_data/add_dylib_link/pubspec.yaml

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+name: add_dylib_link
+description: Add a dylib in the link step.
+version: 1.0.0
+
+publish_to: none
+
+environment:
+  sdk: ^3.0.0
+
+dependencies:
+  logging: ^1.1.1
+  # native_assets_cli: ^0.5.0
+  meta: ^1.12.0
+  native_assets_cli:
+    path: ../../../native_assets_cli/
+
+dev_dependencies:
+  lints: ^3.0.0
+  test: ^1.24.0