Wrap types in protover.rs

Introduce new wrapper types:

• SupportedProtocols
• Versions

Introduce a type alias:

• Version (u32)

git branch: https://github.com/frewsxcv/tor/compare/master...frewsxcv-protover

Patch for https://trac.torproject.org/projects/tor/ticket/24030

Trac:
Username: frewsxcv