Add rust and other fixes to CODEOWNERS

[heaths]

No description provided.

[heaths]

The linter error seems overzealous. We can't update a CODEOWNER for what will exist and have to wait - and remember - to modify it later?

[weshaggard]

The linter error seems overzealous. We can't update a CODEOWNER for what will exist and have to wait - and remember - to modify it later?

We had the linter do that because so many paths don't exist or get deleted. I would prefer to wait until we have those files.

[heaths]

@hallipr is everything hooked up such that these package release files will get created if I were to run release-package.ps1?

@weshaggard I don't see the harm in overriding this. These files will exist. Why do I need to come back later to fix everything when I can do it in one shot now? /cc @RickWinter

[weshaggard]

@heaths you will cause the night job for the linter to break. I suggest adding them later or just holding on merging this PR until they exist.

As for the package index files for rust that takes additional work that will probably come later as I told @hallipr to wait until we actually get some packages before enabling the rust language in this repo.