…n of Single Command Application (lyrixx)

This PR was merged into the 5.1-dev branch.

Discussion
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[Console] Add SingleCommandApplication to ease creation of Single Command Application

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fix #34293
| License       | MIT
| Doc PR        |

---

```php
<?php

require __DIR__.'/vendor/autoload.php';

use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\SingleCommandApplication;

(new SingleCommandApplication())
    ->setName('My Super Command') // Optional
    ->setVersion('1.0.0') // Optional
    ->setProcessTitle('my_proc_title') // Optional
    ->addArgument('who', InputArgument::OPTIONAL, 'Who', 'World')  // Optional
    ->setCode(function(InputInterface $input, OutputInterface $output) {
        $output->writeln(sprintf('Hello %s!', $input->getArgument('who')));
    })
    ->run()
;

```

---

Note: I tried this too, and it works as expected:

```php

class MyCommand extends SingleCommandApplication
{
    public function execute(InputInterface $input, OutputInterface $output)
    {
        $output->writeln('hello');

        return 0;
    }
}

new MyCommand();
```

Commits
-------

4af513d [Console] Add SingleCommandApplication to ease creation of Single Command Application