Request response client - create/destroy/lifecycle

[bretambrose]

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 76.56250% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 83.21%. Comparing base (419f5bc) to head (bd04ad5).

Files	Patch %	Lines
source/request-response/request_response_client.c	78.07%	25 Missing ⚠️
source/request-response/protocol_adapter.c	0.00%	2 Missing ⚠️
source/v5/mqtt5_to_mqtt3_adapter.c	0.00%	2 Missing ⚠️
source/request-response/subscription_manager.c	75.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           SubscriptionManager     #355      +/-   ##
=======================================================
+ Coverage                83.15%   83.21%   +0.05%     
=======================================================
  Files                       24       25       +1     
  Lines                     9493     9613     +120     
=======================================================
+ Hits                      7894     7999     +105     
- Misses                    1599     1614      +15     

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[sbSteveK]

Looks solid outside of potentially missing null checks.