Message Exchange with RabbitMQ

[mocsharp]

We need to decide how we exchange messages with RabbitMQ and how the binary data is formatted.

Currently, I have a single exchange setup (monaideploy) with routing keys, such as, md.workflow.request, md.export.complete, md.export.request.

For binary data encoding, I have data formatted in JSON and then encode the string in UTF8:
Encode in .NET Encoding.UTF8.GetBytes
Decode in Pyton data.decode("utf-8")

We could also format it using BSON.

cc @joshliberty

[mocsharp]

Sample data decoded for md_workflow_request:

'md_workflow_request':'{"Bucket":"igbucket","PayloadId":"2964e940-d3d5-47fe-b8b2-0941daeb3a16","Workflows":[],"FileCount":0}'

[mocsharp]

I have proposed updates to the SRS for IG with the message definitions.

https://github.com/Project-MONAI/monai-deploy-informatics-gateway/blob/d164cf2ce8b728ce87f28a011a715a08201f56f0/guidelines/srs.md#published-events