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 and comments to match https://github.com/slackapi/deno-slack-sdk.

testing

• Confirm that the GitHub teams exist

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 ran deno task test after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.83%. Comparing base (867159f) to head (854bd52).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   96.83%   96.83%           
=======================================
  Files          39       39           
  Lines        1643     1643           
  Branches       25       25           
=======================================
  Hits         1591     1591           
  Misses         52       52           

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[mwbrooks]

@misscoded Thanks for the quick review! 🙇🏻