…kwinza)

This PR was merged into the 5.4 branch.

Discussion
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[Messenger] Add `WorkerMetadata` to `Worker` class.

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fixes #37736
| License       | MIT
| Doc PR        | -

At the moment, there is no clean way to access the values of `transportNames` or recently introduced `queueNames` that the worker was configured with, although such data might be quite useful for logging/monitoring or other tasks.

This PR attempts to fix that by adding a new and extensible way to provide additional information about a particular `Worker` object.

So far, the following PRs could benefit from this change:

- #43133
- #42723

**Use case example:**
----

- As I developer
- When a message was consumed from transport with name `async`.
- And the worker state is `idle`.
- Then I want to reset services.

**Before this PR**, the only solution not relying on using Reflection API would look like this:
```php
    private $servicesResetter;
    private $receiversName;
    private $actualReceiverName = null;

    public function __construct(ServicesResetter $servicesResetter, array $receiversName)
    {
        $this->servicesResetter = $servicesResetter;
        $this->receiversName = $receiversName;
    }

    public function saveReceiverName(AbstractWorkerMessageEvent $event): void
    {
        $this->actualReceiverName = $event->getReceiverName();
    }

    public function resetServices(WorkerRunningEvent $event): void
    {
        if (!$event->isWorkerIdle() && \in_array($this->actualReceiverName, $this->receiversName, true)) {
            $this->servicesResetter->reset();
        }

        $this->actualReceiverName = null;
    }

    public static function getSubscribedEvents(): array
    {
        return [
            WorkerMessageHandledEvent::class => ['saveReceiverName'],
            WorkerMessageFailedEvent::class => ['saveReceiverName'],
            WorkerRunningEvent::class => ['resetServices'],
        ];
    }
```
**With this PR**, one could simply use this to retrieve the transport name.
```php
$event->getWorker()->getWorkerMetadata()->getTransportName() === $this->transportName;
```
So the whole solution would look like this:
```php
    private $servicesResetter;
    private $receiversName;

    public function __construct(ServicesResetter $servicesResetter, array $receiversName)
    {
        $this->servicesResetter = $servicesResetter;
        $this->receiversName = $receiversName;
    }

    public function resetServices(WorkerRunningEvent $event): void
    {
        $actualTransportName = $event->getWorker()->getWorkerMetadata()->getTransportName();
        if (!$event->isWorkerIdle() || !in_array($actualTransportName, $this->receiversName, true)) {
            return;
        }

        $this->servicesResetter->reset();
    }

    public static function getSubscribedEvents(): array
    {
        return [
            WorkerRunningEvent::class => ['resetServices'],
        ];
    }
```

Commits
-------

583f85b [Messenger] Add WorkerMetadata to Worker class