… to assist in writing and discovering app's configuration (nicolas-grekas)This PR was squashed before being merged into the 7.4 branch.Discussion----------[FrameworkBundle] Auto-generate `config/reference.php` to assist in writing and discovering app's configuration| Q             | A| ------------- | ---| Branch?       | 7.4| Bug fix?      | no| New feature?  | yes| Deprecations? | no| Doc PR |symfony/symfony-docs#21511| License       | MITThis PR reverts#61490 and#61885, and builds on#61894.These reverts explain a big chunk of the attached patch.This adds a compiler pass that generates a `config/reference.php` file.This file contains two classes that define array-shapes for app's and routing configuration.Part of these shapes are auto-generated from the list of bundles found in `config/bundles.php`.The `config/reference.php` file should be loaded by a new line in the "autoload" entry of composer.json files: `"classmap": ["config/"]` - recipe update pending. This means that the file should be committed. This is on purpose: as the name suggests, this file is also a config reference for human readers. Having to commit the changes is also a nice way to convey config improvements to the community - at least for ppl that review their commits ;). It also solves a discovery problem that happens with phpstan/etc having a hard time to find the classes currently generated for config builders in the cache directory.With this PR, `config/services.php` could start as such:```php<?phpnamespace Symfony\Component\DependencyInjection\Loader\Configurator;return App::config([    'services' => [        'App\\' => [            'resource' => '../src/'        ],    ],]);```and `config/routes.php` would start as:```php<?phpnamespace Symfony\Component\Routing\Loader\Configurator;return Routes::config([    'controllers' => [        'resource' => 'attributes',        'type' => 'tagged_services',    ]]);```The generated shapes use advanced features that are not fully supported by phpstan / phpstorm. But the gap should be closed soon.PS:https://symfony.com/blog/new-in-symfony-7-4-deprecated-xml-configuration will need an update.Commits-------22349f5 [FrameworkBundle] Auto-generate `config/reference.php` to assist in writing and discovering app's configuration