Add workflow to add PR comment flagging maintainers when API changes are made

[jack-berg]

FYI @jkwatson

[jack-berg]

This is unused. The GH_TOKEN has all the permissions needed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.28%. Comparing base (b665652) to head (c02a87f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8274      +/-   ##
============================================
- Coverage     90.29%   90.28%   -0.02%     
- Complexity     7672     7683      +11     
============================================
  Files           849      850       +1     
  Lines         23165    23182      +17     
  Branches       2341     2348       +7     
============================================
+ Hits          20916    20929      +13     
- Misses         1527     1529       +2     
- Partials        722      724       +2     

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