feat: add CODEOWNERS file

[ncooke3]

CODEOWNERS docs: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners

With this PR, changes to Package.swift, podspecs, GHA files, and release tooling will require approval from a member of @firebase/firebase-ios-sdk-admin

After merging, one repo setting change is needed, modifying main branch protection to "Require review from code owners". e.g.: Settings -> Branches -> find branch, select "Edit"-> scroll down

#no-changelog

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[ncooke3]

Any other directories? scripts/ maybe?

[paulb777]

Yes scripts/

Also,

FirebaseCore/
CODEOWNERS
Interop/
*.md
Dangerfile
Gemfile*

[ncooke3]

Yes scripts/

Also,

FirebaseCore/ CODEOWNERS Interop/ .md Dangerfile Gemfile

Done. Note that CODEOWNERS is in .github so it's convered.