Add support for Kafka-like StreamProcessor module

[Livshitz]

Currently the SDK supports DB, Scheduler, Microservice orchestrator and Messages Queue.
Streaming processors like Kafka, Amazon SQS, Google Pub/Sub, etc, are integral part of modern system architecture. It'd be very beneficial once the SDK will support such simulator.
Placeholder: https://github.com/Livshitz/Dojo-SDK/tree/master/src/StreamProcessor

Contract should resemble MessageQueue module and expose consumer (custom logic for consuming the messages) and producer (module that handles the enqueued messages, ordering, etc).

If you're new to Kafka, here's a nice intro video: https://kafka.apache.org/intro