⭐Feature request - add support for commit reordering and amending non-latest commit

**Is your feature request related to a problem? Please describe.**
I'd like support for commit reordering like in lazygit.
I frequently have to add a temporary commit when working on features, but later discard that temp commit.
So I end up keeping that commit on top.

And related is the ability to amend older commits, also available in lazygit.

**Describe the solution you'd like**
To be at feature parity with lazygit with respect to the ability of amending commits.

**Describe alternatives you've considered**
NA

**Additional context**
I really like the space to select functionality in gitUI vs the shift+arrows in lazygit.
In case gitui goes on to support squashing, this workflow will be superior in supporting squashes of non-consequent commits.