[feature] Version commit & tag support

[chimon2000]

If any of the version commands are run in a git repo, they would also create a version commit and tag. For inspiration, look at how npm version works.

I could see this either being enabled by default or enabled using a flag.

[f3ath]

That would create tight coupling to git. I would prefer to avoid it. To make a tag, one can do git tag $(cider version)