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 Python team and Education team as code owners to match https://github.com/slackapi/bolt-js, https://github.com/slackapi/bolt-python, and https://github.com/slackapi/slack-cli.

Testing

N/A

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)
• Other

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 python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.36%. Comparing base (ae36655) to head (30ea8c0).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #1791 +/- ##
=======================================
Coverage 84.36% 84.36% =======================================
Files 115 115 Lines 12399 12399 =======================================
Hits 10460 10460 Misses 1939 1939 

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[mwbrooks]

@vegeris Thanks for the kind approval! 🙇🏻