Invalid codeowners should be filtered out

[pratikmallya]

e.g. if a file has a codeowners like:

a/** cool-team # TODO: change

this library spits out 4 code owners: cool-team, #, TODO: and change. While nothing can be done for change at least # is a known invalid codeowner

[ThisIsMissEm]

afaik, You can't have comments on rule lines, so this would actually be invalid. You'd have to write:

# TODO: change
a/** @cool-team

Further more, you'd need the @ sign for GitHub and GitLab to handle the team/username correctly.

See:

• https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners
• https://docs.gitlab.com/ee/user/project/code_owners.html#the-syntax-of-code-owners-files

[pratikmallya]

For invalid syntax, perhaps the library should indicate that and/or fail rather than continuing to parse the invalid data and generating invalid codeowners.