Interactive option for av stack restack

[dhaus67]

Sometimes, when working with stacked PRs there might be commits which I want to squash / edit before pushing them to remote.

It would be nice if av stack restack would allow to also support to interactively rebase the commits on each branch and allow the usual suspects of squashing, editing commits etc.

Alternatively, the missing options could also be added to av stack reorder but the restack command feels like the more intuitive option to me comparing it to standard git operations.

[draftcode]

I think that we can do the same check as --autosquash and prompt the user to do the squash. So it's like:

   Commits included in branch `feature-xyz` has an autosquash keyword.
   
   * Implement XYZ
   * amend!: fix a typo
   * amend!: regenerate autogen files
   
   Do you want to autosquash these commits? [y|n]