Add Repo Maintainers to CODEOWNERS file

# Update CODEOWNERS to provide maintainers ownership of all files in their repos

**Description**:

Update this repositories `.github/CODEOWNER` file to ensure that the repository maintainer
group(s) have full control of the files in this repository.

Start by inspecting the repository's .github/CODEOWNER file and identifying the maintainer group names; the issue does not specify the exact group handles or clarify the file spelling. Done means the CODEOWNERS configuration grants the repository maintainer group or groups ownership of all files.

Written by the indexing model from the issue text.