This is just a simple proxy because we can't lazy load RabbitMQ service just to count number of messages in the queue.
As they are automatically injected in the controller now, we can't lazy load them.
Also forgot to use `AbstractController` in previous PR about _controller as a service_.
Mostly using autowiring to inject deps.
The only tricky part was for import because all producer use the same class and have a different alias. So we must write them down in the service definition, autowiring doesn't work in that case.
Usually:
- if a controller has a constructor, it means injected services are at least re-used once in actions
- otherwise, service are injected per action
