Additional git support

[OrthoDex]

Hey!
I noticed betty has support for undoing git add, I would like to add some additional support based on my own experience.
Initially when contributing to repos, which needed squashing my commits, I saw myself referring to the rebase command multiple times. It would be nice to have support for git rebase in betty.

I would really appreciate inputs on this 😄

[pickhardt]

Can you give some example syntax and responses you are expecting?

[OrthoDex]

Hey @pickhardt , some of the use cases could be:

betty show commits
Betty: Running git log --pretty=oneline --abbrev-commit

another could be:

betty squash my last 5 commits
Betty: Running git rebase -i HEAD~5 ...
Listing last 5 commits in chronological order.