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 JavaScript team and Education team as code owners to match other projects like the https://github.com/slackapi/slack-cli.

Requirements (place an x in each [ ])

• 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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.02%. Comparing base (199a3eb) to head (c6cb748).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2430   +/-   ##
=======================================
  Coverage   93.02%   93.02%           
=======================================
  Files          40       40           
  Lines       11127    11127           
  Branches      713      713           
=======================================
  Hits        10351    10351           
  Misses        764      764           
  Partials       12       12           

Flag	Coverage Δ
cli-hooks	95.23% <ø> (ø)
cli-test	94.79% <ø> (ø)
oauth	77.39% <ø> (ø)
socket-mode	61.87% <ø> (ø)
web-api	98.08% <ø> (ø)
webhook	96.66% <ø> (ø)

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[mwbrooks]

@vegeris So fast! Thanks a lot! 👏🏻