…iles with trans() in translation commands (yceruto)

This PR was merged into the 4.3-dev branch.

Discussion
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[FrameworkBundle][Translation] Added support for PHP files with trans() in translation commands

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #29085
| License       | MIT
| Doc PR        | -

This PR allows translation commands be able to debug and update translation messages from any PHP file/class defined as service, injecting or wiring the `translator` service, e.g.:
```php
use Symfony\Component\Translation\TranslatorInterface;

class ParallelUniverseController extends AbstractController
{
    public function hello(Request $request, TranslatorInterface $translator)
    {
        // this id 'hello_message' will be extracted from translation:update
        $message = $translator->trans('hello_message');

        // send message to space...
    }
}
```
this supports all ways of wiring (auto or not): via constructor, public property, method calls, service subscriber and controller argument.

Commits
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9f9b828 Added support for PHP files with translation in translation commands

…P files (javiereguiluz)

This PR was squashed before being merged into the 4.3 branch (closes #11598).

Discussion
----------

Mentioned the extraction of translation contents from PHP files

See symfony/symfony#30120 and https://symfony.com/blog/new-in-symfony-4-3-extracting-translation-contents-from-php-files.

Commits
-------

f82ad62 Mentioned the extraction of translation contents from PHP files