…`ConsoleAlarmEvent` (HypeMC)

This PR was merged into the 7.2 branch.

Discussion
----------

[Console] Add ability to schedule alarm signals and a `ConsoleAlarmEvent`

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Issues        | Fix #47920
| License       | MIT

Part of #53508

This PR introduces the ability to schedule alarm signals and a `console.alarm` event. A command using this feature will automatically dispatch an alarm at the specified interval:

```php
#[AsCommand('app:alarm')]
class AlarmCommand extends Command implements SignalableCommandInterface
{
    private bool $run = true;
    private int $count = 0;
    private OutputInterface $output;

    protected function initialize(InputInterface $input, OutputInterface $output): void
    {
        $this->getApplication()->setAlarmInterval(10);
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $this->output = $output;

        while ($this->run) {
            $this->count++;
            $output->writeln('execute '.$this->count);
            sleep(1);
        }

        $output->writeln('Done');

        return Command::SUCCESS;
    }

    public function getSubscribedSignals(): array
    {
        return [\SIGINT, \SIGALRM];
    }

    public function handleSignal(int $signal, false|int $previousExitCode = 0): int|false
    {
        if (\SIGINT === $signal) {
            $this->run = false;
            $this->output->writeln('Bye');
        } elseif (\SIGALRM === $signal) {
            $this->count = 0;
            $this->output->writeln('handleAlarm');
        }

        return false;
    }
}
```

The `console.alarm` event is dispatched on every `SIGALRM` signal:

```php
#[AsEventListener(event: ConsoleAlarmEvent::class)]
final class ConsoleAlarmListener
{
    public function __invoke(ConsoleAlarmEvent $event): void
    {
        $event->getOutput()->writeln('ConsoleAlarmListener');
    }
}
```

Commits
-------

97e4391 [Console] Add ability to schedule alarm signals and a `console.alarm` event

… that are still being processed (valtzu)

This PR was merged into the 7.2 branch.

Discussion
----------

[Messenger] Extend SQS visibility timeout for messages that are still being processed

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| License       | MIT

Now that #53508 is merged, let's add keepalive implementation for SQS too.

Commits
-------

fa795c3 [Messenger] Extend SQS visibility timeout for messages that are still being processed

…eanstalkd) (OskarStark)

This PR was squashed before being merged into the 7.2 branch.

Discussion
----------

[Messenger] Describe `--keepalive` option (AmazonSQS & Beanstalkd)

Follows
* symfony/symfony#53508

Fixes #20305 #20381

cc `@HypeMC` `@chalasr`

Commits
-------

8ce8f9b [Messenger] Describe `--keepalive` option (AmazonSQS & Beanstalkd)