[feature] Support RocketMQ as async consumer backend

[lajxw]

Is your feature request related to a problem? Please describe.
When I tried to integrate async consumers with my existing messaging infrastructure, I found that RocketMQ is currently not supported.
Since RocketMQ is a widely used message queue system in distributed applications, the lack of support makes it difficult to use this project together with RocketMQ-based architectures.

Describe the solution you'd like.
I would like to request the addition of RocketMQ support as an async consumer backend.

[FZambia]

Hello @lajxw

Thanks for the suggestion.

There were no short-term plans to add more built-in consumers to Centrifugo (only RabbitMQ is sth we still want).

But let's keep this open, in case of enough interest in the community – we can add RocketMQ at some point. Personally, I don't know much about it at this point.

Note, that while there is no built-in consumer you still can use your own consumers and call Centrifugo server API from them.