Automagically do a topographic sort of branches when creating a stack

[lishaduck]

I had a bunch of branches locally and ran the following command, where the branches were ordered by whatever order lazygit had them:

gh stack init comps comps-legit-stay-sorted comps-sorted comps-stay-sorted comps-get-deeply-sorted

I expected that this would properly do a topographic sort, so that it could figure out that comps-legit-stay-sorted went after comps-stay-sorted (really useful names, I know. The commits were more useful). I had no indication that they were out-of-order in the submission TUI beyond that the names were derived from the branches instead of the commits because all of the branches had multiple (or negative?) commits. Once I ran the correct command:

gh stack init comps comps-sorted comps-stay-sorted comps-legit-stay-sorted comps-get-deeply-sorted

Then everything worked fine, but it'd be nice to not have to do all of that. I suppose the "stacking suggestions" could help some, but only if you create a PR first. I'd rather use the stacking CLI.