Enhance RabbitMQ clients to support Fanout Exchanges

[jvanecek]

Add support for RabbitMQPublisher to publish to exchanges
Add support for RabbitMQWorker to bind queues to exchanges

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.74%. Comparing base (28fe5ab) to head (979a7d5).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release-candidate      #44      +/-   ##
=====================================================
+ Coverage              63.66%   65.74%   +2.08%     
=====================================================
  Files                     90       90              
  Lines                   5977     6160     +183     
=====================================================
+ Hits                    3805     4050     +245     
+ Misses                  2172     2110      -62     

Flag	Coverage Δ
	65.74% <100.00%> (?)

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