Add CODEOWNERS to the existing repositories

[gastaldi]

It would be nice if the existing repositories had a .github/CODEOWNERS file, so when PRs are opened against the repositories, GitHub would automatically ask the team that is responsible for that repository for a review

[gastaldi]

Created using the following script:

./patch.sh -b codeowners -t "Create CODEOWNERS" -m "- As suggested in https://github.com/quarkiverse/quarkiverse-devops/issues/274" -j /Users/ggastald/workspace/quarkiverse/quarkiverse-devops/patches/CreateCodeowners.java