[vcpkg] Add CI check for version files and update maintainer's guideline

[vicroms]

Enables CI checks for version files and updates maintainer guidelines.

[vicroms]

Pinging @dan-shaw

This affects the submission process and after this has been merged we will probably need to rerun CI on some previously reviewed PRs.

Also, even though it is a bit expensive, we may also want to enable the --verify-git-trees flag.
It runs extra checks that protects from users declaring a version in the file and declaring a git tree that checks out a completely different one.

With --verify-git-trees: ~3m 30s
Without --verify-git-trees: ~1s

[dan-shaw]

LGTM. I will pause merging any PRs that will delay this PR.

@PhoebeHui @JackBoosY @NancyLi1013 @JonLiu1993 After this PR is merged, we will need to make sure all PRs that update the CONTROL file also update the respective baseline files for versioning.

[PhoebeHui]

@dan-shaw @vicroms, we will check the version and rerun all the PRs, thanks for the information!