Add framework for posting generated reviews to GitHub

[cottsay]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.86441% with 45 lines in your changes missing coverage. Please review.

Project coverage is 55.74%. Comparing base (611639a) to head (a6e5e08).
Report is 1 commits behind head on main.

Files	Patch %	Lines
rosdistro_reviewer/submitter/github.py	40.00%	27 Missing ⚠️
rosdistro_reviewer/submitter/__init__.py	62.50%	10 Missing and 2 partials ⚠️
rosdistro_reviewer/verb/review.py	76.92%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #7       +/-   ##
===========================================
+ Coverage   37.11%   55.74%   +18.63%     
===========================================
  Files           6       11        +5     
  Lines         291      409      +118     
  Branches       84       95       +11     
===========================================
+ Hits          108      228      +120     
+ Misses        180      176        -4     
- Partials        3        5        +2     

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