Type setuptools/msvc.py dir methods and properties

[Avasam]

Summary of changes

Extracted from #4744 with additional fixes

Pull Request Checklist

• [x] Changes have tests (type-checking tests)
• [ ] News fragment added in newsfragments/. (See [documentation][PR docs] for details)

[PR docs]: https://setuptools.pypa.io/en/latest/development/developer-guide.html#making-a-pull-request