chore: added workflow for handling answerable discussions

[khushail]

Issue #, if available:

Description of changes:

This workflow will handle the discussions (posted in answerable category) and take appropriate action.

Whenever a discussion is replied with keyword @github-actions proposed-answer, is considered for action by this workflow and based on the responses/reactions received, appropriate action is taken.

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: 91.10% and project coverage change: +1.07% :tada:

Comparison is base (83e7abe) 81.13% compared to head (2d831c7) 82.21%. Report is 10 commits behind head on main.

:exclamation: Current head 2d831c7 differs from pull request most recent head 96c01e0. Consider uploading reports for the commit 96c01e0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   81.13%   82.21%   +1.07%     
==========================================
  Files          18       20       +2     
  Lines        7841     8709     +868     
==========================================
+ Hits         6362     7160     +798     
- Misses       1479     1549      +70     

Files Changed	Coverage Δ
source/mqtt.c	94.59% <ø> (ø)
source/v5/mqtt5_to_mqtt3_adapter.c	76.09% <ø> (ø)
source/v5/mqtt5_topic_alias.c	96.09% <ø> (-0.08%)	:arrow_down:
source/client_channel_handler.c	74.60% <72.22%> (+4.51%)	:arrow_up:
source/v5/mqtt5_utils.c	80.09% <72.41%> (-2.69%)	:arrow_down:
source/v5/mqtt5_client.c	88.15% <89.47%> (+0.07%)	:arrow_up:
source/client.c	69.55% <95.23%> (+0.15%)	:arrow_up:
source/mqtt_subscription_set.c	97.15% <97.15%> (ø)
source/mqtt311_decoder.c	98.80% <98.80%> (ø)
source/client_impl_shared.c	85.18% <100.00%> (+3.36%)	:arrow_up:
... and 2 more

... and 1 file with indirect coverage changes

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