…files (pierredup)

This PR was merged into the 3.3-dev branch.

Discussion
----------

[DependencyInjection] Use glob pattern to load config files

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #21173
| License       | MIT
| Doc PR        | -

This relates to #21173, but I'm not sure if it completely fixes the issue.

This allows to use a glob pattern to load config files, which makes the following possible:

```
# config.yml
imports:
    - { resource: "*.yml" }
    - { resource: "folder/*.yml" }
    - { resource: "/etc/myapp/*.{yml,xml}" }
```

It can also be used in a container extension, if a bundle uses a lot of configs:

```
$loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
$loader->load('*.yml');
$loader->load('routing/*');
```

Commits
-------

519180e Use glob pattern to load config file

This PR was merged into the 3.3-dev branch.

Discussion
----------

added support for glob loaders in Config

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | not yet

In #21270, we added the possibility to use glob patterns to import (not load) config files, but it was restricted to the container. The same feature could be useful (and I actually have a use case) for the routing.

So, this PR moves the logic to the Config component. It also adds a new `GlobFileLoader` class that allows to load glob patterns (not just import them as in #21270).

Last, but not least, the new glob file loader is registered in both the routing and the container default loaders.

Here is a simple, but powerful example, using the Symfony micro kernel (actually, this is a snippet from the Kernel used in Symfony Flex :)):

```php
<?php

namespace Symfony\Flex;

use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    const CONFIG_EXTS = '.{php,xml,yaml,yml}';

    // ...

    protected function configureContainer(ContainerBuilder $container, LoaderInterface $loader)
    {
        $confDir = dirname($this->getRootDir()).'/etc';
        $loader->import($confDir.'/packages/*'.self::CONFIG_EXTS, 'glob');
        $loader->import($confDir.'/packages/'.$this->getEnvironment().'/**/*'.self::CONFIG_EXTS, 'glob');
        $loader->import($confDir.'/container'.self::CONFIG_EXTS, 'glob');
    }

    protected function configureRoutes(RouteCollectionBuilder $routes)
    {
        $confDir = dirname($this->getRootDir()).'/etc';
        $routes->import($confDir.'/routing/*'.self::CONFIG_EXTS, '/', 'glob');
        $routes->import($confDir.'/routing/'.$this->getEnvironment().'/**/*'.self::CONFIG_EXTS, '/', 'glob');
        $routes->import($confDir.'/routing'.self::CONFIG_EXTS, '/', 'glob');
    }
}
```

Commits
-------

025585d added support for glob loaders in Config