[chore] add automation for codeowner tooling

[mowies]

This PR copies over automation from the collector-contrib repo and slightly adjusts it where needed.
The PR includes 3 new workflows:

• add-labels: enables users to add labels to issues by commenting /label <the-label> (although github org and other permissions apply)
• ping-codeowners-issues: ping codeowners of a component if the label for that component was added to an issue
• ping-codeowners-on-new-issue: search the issue text for components and add labels accordingly, then ping code owners

Part of #11562

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.54%. Comparing base (e27c4ae) to head (0632679).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11739   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         443      443           
  Lines       23764    23764           
=======================================
  Hits        21754    21754           
  Misses       1637     1637           
  Partials      373      373           

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