Add a Git option in the config wizard

[JoshuaKGoldberg]

🚀 Feature Request

Following #807, the config wizard should offer to add git add, git commit, etc. to make a series of commits for each step of the process.

Existing Behavior

Nothing about Git is in TypeStat.

Change Proposal

Have the config wizard ask if the person is using Git (and default to yes iff .gitignore exists). Have each step of the config be added as a granular Git commit so consumers can see the steps done.