rabbitmq: support specifying exchange per routing key in RabbitSubscribe

[ttshivers]

Allow specifying the exchange name per routingKey in RabbitSubscribe to allow or binding the queue to routing keys from multiple exchanges

[github-actions]

This issue is stale because it has been open for 30 days with no activity.

[gaffarmalik]

This feature is quite important for people who don't want 1 queue per routing key.
Any luck?

[Tchekda]

This feature is quite important for people who don't want 1 queue per routing key. Any luck?

I can confirm, would be great
Related to #1053

But the explanation is here #775 (comment)