Make 'git stash list' more informative

Currently 'git stash list' prints lines like this: stash@{10}: WIP on main: 3f802b772d88 science/py-pymatgen: update 2025.1.24 → 2025.2.18

It contains the last commit's subject which often/usually doesn't really describe the stash entry.

I propose to amend WIP stash entry descriptions with size, number of dirs and files, and time description, so that the above entry might look like this:

stash@{10}: WIP on main: 3f802b772d88 science/py-pymatgen: update 2025.1.24 → 2025.2.18 (+20, -5, 3 dirs, 5 files, 17 days ago)

It would add info about the number of changed lines, number of affected directories and files, and how old this stash record is.

This would make WIP stash lines much more informative and they would actually describe better what is in them.

Thanks, Yuri