oxidize `vergen`

[Byron]

Needed from gitoxide

• information about branch and commit
• git describe - NOT git name-rev ;).
  • implementation
  • use it in vergen
  • dirty-working-tree tracking with suffix
• unambiguous short-id

Integration progress

• make CI pass
  • figure out which path has issues
• implement features
• cleanup history
• [RFC] transition to gitoxide rustyhorde/vergen#112
• can the MSRV be stored? Note that vergen occasionally updates their MSRV so this problem goes away with time.
  • [Q&A] Is it possible to target edition=2018 instead? microsoft/windows-rs#1699
  • merge Enable MSRV checks on windows (#298) #394 , switch to winapi if needed
• get PR merged or closed

https://lib.rs/crates/vergen
https://github.com/byron/vergen