Request operations

[bretambrose]

• Support for request-response operations
• Refactoring of rr-client <-> subscription manager contract/responsibilities to support requests without correlation tokens (fleet provisioning service)
• tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.71271% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 83.97%. Comparing base (1e2bb6e) to head (37f4b57).

Files	Patch %	Lines
source/request-response/request_response_client.c	91.52%	15 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                         @@
##           RefactorProtocolAdapterUserdata     #364      +/-   ##
===================================================================
+ Coverage                            83.83%   83.97%   +0.13%     
===================================================================
  Files                                   24       24              
  Lines                                10135    10294     +159     
===================================================================
+ Hits                                  8497     8644     +147     
- Misses                                1638     1650      +12     

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