Adds governance configuration

[jeffmaher-bloom]

Pull Request Background

This implements the configuration to control who can review and approve changes to the Handbook. This is based on the governance proposal doc.

Anyone reviewing can look at the .github/CODEOWNERS file to see which files are assigned to which group.

GitHub Issue

• Closes Implement governance plan in code and content #34

What Changed

Outside the pull request, a few non-code changes happened:

• Added teams that are the groups of approvers based on topic
• Turn on the repository setting that assigns reviewers based on the .github/CODEOWNERS setting
• Turn on the repository setting that requires reviews/approvals from the assigned groups in .github/CODEOWNERS

In terms of code changes, added the .github/CODEOWNERS file.

Other Notes

Unfortunately, this can't really be tested until it's merged. This is because the configuration doesn't fully take effect until it's in the main branch. This means that there will likely be some bugs that will need to be followed up with subsequent pull requests.

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[jeffmaher-bloom]

@coreycaitlin and @dottiebobottie : Let me know if you want to review together, but feel free to review independently if the configuration file reads clearly to you.

[coreycaitlin]

Let's merge so we can see how it works!