feat: Add org rule-suites APIs

[ralucas]

• Adds list org rule suites: GET /orgs/{org}/rulesets/rule-suites
• Adds get org rule suite by id: GET /orgs/{org}/rulesets/rule-suites/{rule_suite_id}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.52%. Comparing base (30af001) to head (dd2fe7d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4482   +/-   ##
=======================================
  Coverage   98.51%   98.52%           
=======================================
  Files         195      196    +1     
  Lines       17691    17727   +36     
=======================================
+ Hits        17429    17465   +36     
  Misses        262      262           

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[gmlewis]

Thank you, @ralucas!
LGTM.
Awaiting second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @Not-Dhananjay-Mishra