Support multiple subscriptions in request operations

[bretambrose]

• Refactor request operations to support multiple subscription filters

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 98.91304% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.04%. Comparing base (37f4b57) to head (9ab9fd6).

Files	Patch %	Lines
source/request-response/subscription_manager.c	98.18%	1 Missing :warning:

Additional details and impacted files

@@                  Coverage Diff                  @@
##           RequestOperations     #365      +/-   ##
=====================================================
+ Coverage              83.97%   84.04%   +0.07%     
=====================================================
  Files                     24       24              
  Lines                  10294    10335      +41     
=====================================================
+ Hits                    8644     8686      +42     
+ Misses                  1650     1649       -1     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.