[objective_c] Automate generation of ffigen's built in ObjC types lists

[liamappelbe]

The ffigen config is now the canonical list of all the built in bindings. Also, run the interface_lists_test inside the code generator. That way, the old loop up regenerating the bindings, running the tests, and fiddling with the various lists of built-ins is reduced to:

1. Run the bindings generator
2. If it fails, add more bindings to ffigen_objc.yaml
3. Repeat until it succeeds

Fixes #1249

[github-actions]

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// Copyright (c) 2025, 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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Files
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/native_doc_dartifier/example/native_doc_dartifier_example.dart
pkgs/native_doc_dartifier/lib/native_doc_dartifier.dart
pkgs/native_doc_dartifier/lib/src/native_doc_dartifier_base.dart
pkgs/native_doc_dartifier/test/native_doc_dartifier_test.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

[coveralls]

coverage: 90.942%. first build
when pulling b92d615 on objc_built_in_gen
into 215277e on main.