Request response operations

[bretambrose]

Basic support for submitting request operations and creating streaming operations.

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 89.58333% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 83.33%. Comparing base (bd04ad5) to head (15e8a32).

Files	Patch %	Lines
source/request-response/request_response_client.c	89.58%	20 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##           RequestResponseClient     #356      +/-   ##
=========================================================
+ Coverage                  83.21%   83.33%   +0.12%     
=========================================================
  Files                         25       25              
  Lines                       9613     9805     +192     
=========================================================
+ Hits                        7999     8171     +172     
- Misses                      1614     1634      +20     

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[sbSteveK]

Trivial comments may need attending at discretion.