[pub_formats] Add analysis options

[dcharkes]

I noticed this while trying to play around with the new analyzer plugins (which need to be at the root of the workspace).

[github-actions]

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// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
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pkgs/objective_c/example/command_line/lib/main.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

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[github-actions]

PR Health

License Headers ✔️

// Copyright (c) 2026, 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.

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pkgs/hooks_runner/test_data/download_assets/hook/build.dart
pkgs/jni/test/debug_release_test.dart
pkgs/objective_c/example/command_line/lib/main.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

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[coveralls]

Changes unknown
when pulling bd0c997 on pub-formats-analysis-options
into ** on main**.

[goderbauer]

LGTM

[goderbauer]

Missing pubspec entry for this?