Support cross protocol exchange to exchange binding

[kickster97]

Is your feature request related to a problem? Please describe.
You can currently not bind the MQTT exchange or session to an AMQP exchange or queue.

Describe the solution you'd like
I would like to be able to bind a mqtt exchange/session to an AMQP exchange or queue.

Supporting this probably means we need to adapt the way the exchanges routes messages, have some sort of AMQP/MQTT conversion.

[kickster97]

Investigate if fit is possible to solve with the mqtt solution as is, in an easy way.
Otherwise it should be a part of the separation work between AMQP and MQTT.