feat(rabbitmq): add rabbitmq message handling

[WonderPanda]

These changes allow you to use user-defined parser and serializer for messages passed through RabbitMQ.

[WonderPanda]

Some things that still need to get updated before this can go through:

• finish integrating this with the new error handling logic that was recently introduced
• include some integration tests that verify the serialization/deserialization behavior
• cleanup the placement/naming of some interfaces and functions
• probably some docs

[underfisk]

I'm closing/archiving this, it seems to be outdated and may not work as expected. Feel free to revive this if we'd like to get it across the finish line