Add ability to edit several commit messages at once

[Tej12345]

subj

[mark2185]

I'm not aware of a way to do this even through the CLI, but the closest I can think of is interactive rebase where each commit has the reword action.

@jesseduffield I know that you mentioned in the 15 lazygit features in under 15 minutes that "you can't do a reword [...] we haven't got that feature yet", was there a technical reason blocking it, or was it just not implemented yet?

[jesseduffield]

@mark2185 there's a good chance it's much easier to implement now than it was back then (thanks to being able to suspend the application more easily and switch to a subprocess)