Update CODEOWNERS file
Add *.go to the pattern to match and add existing maintainers as code owners. Keep the code owners for *.rb as is and add new ones. Removed *.rake as we don't have rake files anymore.
Add *.go to the pattern to match and add existing maintainers as code owners. Keep the code owners for *.rb as is and add new ones. Removed *.rake as we don't have rake files anymore.