Ensure we respect inline comments

[markjm]

# Comments are valid inline in a codeowners file, but we currently treat them as more usernames. This change ensures we treat comments as such and strip them from the usernames. I have chosen to include the comment string in the underlying datastructure because it could be useful (and makes sense to me that a parser would not drop information).

Thanks @beaugunderson for your work on this project

[markjm]

Perhaps worth noting that inline comments have been confirmed to be supported and are now included as an example in the docs

https://docs.github.com/en/enterprise-cloud@latest/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners (search for inline)