Add Webhook for Repository ruleset

[unamdev0]

Added Repository ruleset event
Fixes #3295

[unamdev0]

@gmlewis please ignore the previous PR and review this. This PR contains just my code and hasn't been reabased with master branch.
updated RuleSet to Ruleset everywhere, also improved the comment describing the repository ruleset event

[gmlewis]

I'm going to hold off reviewing this one until comments from the last PR are addressed.
Specifically,

Godocs should always use complete sentences with punctuation so that the auto-generated package documentation formats and reads nicely.

It looks like GitHub ate my other lengthy comment, unfortunately... but the gist of it was that every exported struct needs a Godoc-style comment to explain its purpose and usage for the auto-generated package documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.05%. Comparing base (2b8c7fa) to head (e63118c).
Report is 133 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3305      +/-   ##
==========================================
- Coverage   97.72%   93.05%   -4.67%     
==========================================
  Files         153      172      +19     
  Lines       13390    11772    -1618     
==========================================
- Hits        13085    10955    -2130     
- Misses        215      723     +508     
- Partials       90       94       +4     

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[unamdev0]

I'm going to hold off reviewing this one until comments from the last PR are addressed.
Specifically,

Godocs should always use complete sentences with punctuation so that the auto-generated package documentation formats and reads nicely.

It looks like GitHub ate my other lengthy comment, unfortunately... but the gist of it was that every exported struct needs a Godoc-style comment to explain its purpose and usage for the auto-generated package documentation.

Got it, will add comments for every new struct added and will let you know