Start to abstract message brokers

[rkm]

Proposed Changes

Start to refactor RabbitMqAdapter logic into generic interface

• Rename IRabbitMqAdapter -> IMessageBroker
• Move into Smi.Common.Messaging namespace
• Add MessageBrokerType and MessageBrokerFactory (not currently used)
• Create ConnectionFactory directly in RabbitMQBroker

This will be part of a larger refactor of the messaging logic.

Types of changes

What types of changes does your code introduce? Tick all that apply.

• Bugfix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that would cause existing functionality to not work as expected)
• Documentation-Only Update (if none of the other choices apply)
  • In this case, ensure that the message of the head commit from the source branch is prefixed with [skip ci]

Checklist

By opening this PR, I confirm that I have:

• Reviewed the contributing guidelines for this repository
• Ensured that the PR branch is in sync with the target branch (i.e. it is automatically merge-able)
• Updated any relevant API documentation
• Created or updated any tests if relevant
• Created a news file
  • NOTE: This must include any changes to any of the following files: default.yaml, any of the RabbitMQ server configurations, GlobalOptions.cs
• Listed myself in the CONTRIBUTORS file 🚀
• Requested a review by one of the repository maintainers

Issues

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (09067d3) 59.63% compared to head (a1288b2) 59.68%.

Files	Patch %	Lines
...Processor/Execution/DicomDirectoryProcessorHost.cs	0.00%	4 Missing ⚠️
...rc/common/Smi.Common/Execution/MicroserviceHost.cs	60.00%	4 Missing ⚠️
...s.CohortExtractor/Execution/CohortExtractorHost.cs	0.00%	3 Missing ⚠️
src/applications/Setup/EnvironmentProbe.cs	0.00%	1 Missing ⚠️
src/common/Smi.Common/Messaging/RabbitMQBroker.cs	92.30%	0 Missing and 1 partial ⚠️
...ionalMapper/Execution/DicomRelationalMapperHost.cs	0.00%	1 Missing ⚠️
...DicomReprocessor/Execution/DicomReprocessorHost.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1746      +/-   ##
==========================================
+ Coverage   59.63%   59.68%   +0.04%     
==========================================
  Files         185      184       -1     
  Lines        6672     6675       +3     
  Branches      933      932       -1     
==========================================
+ Hits         3979     3984       +5     
+ Misses       2426     2425       -1     
+ Partials      267      266       -1     

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