Adapter subscriptions

[bretambrose]

Shared subscription set implementation

• Topic tree support for mqtt 311 per-subscription publish received callbacks
• Per-topic-filter subscription record tracking for resubscribe support
• The subscription set could eventually replace the topic tree in the mqtt 311 implementation, but for now leave it alone

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

Patch coverage: 97.22% and project coverage change: +0.43 🎉

Comparison is base (07bfc59) 81.11% compared to head (a09799a) 81.54%.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           AdapterOperationalState     #302      +/-   ##
===========================================================
+ Coverage                    81.11%   81.54%   +0.43%     
===========================================================
  Files                           18       19       +1     
  Lines                         7959     8134     +175     
===========================================================
+ Hits                          6456     6633     +177     
+ Misses                        1503     1501       -2     

Impacted Files	Coverage Δ
source/v5/mqtt5_topic_alias.c	96.09% <ø> (-0.08%)	⬇️
source/mqtt_subscription_set.c	97.15% <97.15%> (ø)
source/client_impl_shared.c	84.61% <100.00%> (+1.28%)	⬆️

... and 3 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.