chore: Add .github/CODEOWNERS file

[mwbrooks]

Summary

This pull request adds a .github/CODEOWNERS file to adhere to the Salesforce Open Source project requirements.

I've also added the Education team for the docs/ directory (even though no directory exists) and comments to match https://github.com/slackapi/python-slack-sdk.

Testing

• Confirmed that GitHub teams have write access to this repo.

Special notes

• N/A

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_and_run_tests.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.68%. Comparing base (508d604) to head (0802849).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #77   +/-   ##
=======================================
  Coverage   94.68%   94.68%           
=======================================
  Files          11       11           
  Lines         207      207           
=======================================
  Hits          196      196           
  Misses         11       11           

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[mwbrooks]

@misscoded Thanks again! 👏🏻 🙇🏻