Add MQ capabilities

[h3mmy]

For distributed bloopyboi deployments, we want to de-couple the event processing from the app-instance.

First pass implementation should probably be via NATS due to low resource requirements and low complexity.

See https://docs.nats.io/nats-concepts/service_infrastructure/adaptive_edge_deployment

Should be mindful of future flexibility so try to make it broker agnostic using an adapter layer. Keeping the message schema compliant with the CloudEvents standard is probably a good idea. https://github.com/cloudevents/spec