…help writing PHP configs using yaml-like arrays (nicolas-grekas)

This PR was merged into the 7.4 branch.

Discussion
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[DependencyInjection][Routing] Define array-shapes to help writing PHP configs using yaml-like arrays

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Issues        | -
| License       | MIT

Related to #58771.

This PR adds array-shape helpers:

An example for `routes.php`:
```php
use Symfony\Config\RoutesConfig;

return new RoutesConfig([
    'controllers' => [
        'resource' => 'attributes',
        'type' => 'tagged_services',
    ],
]);
```

And one for `services.php`:
```php
use App\Bar;
use Symfony\Config\ServicesConfig;

return new ServicesConfig(
    defaults: [
        'autowire' => true,
        'autoconfigure' => true,
    ],
    services: [
        'App\\' => ['resource' => '../src/']
        Bar::class => null,
        'my_service' => [
            'class' => Bar::class,
            'arguments' => ['%foo%'],
        ],
]);
```

The `ServicesConfig` and `RoutesConfig` wrappers around the arrays are totally optional: the style in #61894 remains possible.
Yet, those wrappers provide array-shapes that can be used by static analyzers and IDEs.

This also works when nesting behind `when@%env%`:
```php
return [
    'when@dev' => new ServicesConfig([...]);
];
```

Note that as far as IDEs are concerned, autocompletion doesn't work yet for the complex shapes used in `ServicesConfig` - neither in vscode nor in phpstorm /cc `@pronskiy` 🙏

Commits
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38306ed [DependencyInjection][Routing] Define array-shapes to help writing PHP configs using yaml-like arrays

… to assist in writing and discovering app's configuration (nicolas-grekas)

This PR was squashed before being merged into the 7.4 branch.

Discussion
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[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       | MIT

This 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
<?php

namespace Symfony\Component\DependencyInjection\Loader\Configurator;

return App::config([
    'services' => [
        'App\\' => [
            'resource' => '../src/'
        ],
    ],
]);
```

and `config/routes.php` would start as:

```php
<?php

namespace 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
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22349f5 [FrameworkBundle] Auto-generate `config/reference.php` to assist in writing and discovering app's configuration