Add AMQP support

[bartbrinkman]

Is your feature request related to a problem? Please describe.
Not necessarily.

Describe the solution you'd like
Like ApiHandlers, but for AMQP queues/messages.

Describe alternatives you've considered
I'm currently resolving (hacking) this by starting an AMQP consumer that does a local HTTP request to an API handler (for every message on a queue) that can map the message itself to a command. I would like to access the resolve context when consuming AMQP messages.

Additional context
Adding handlers for similar wire-level protocols (or those covering this and more like Kafka) might be interesting too.