Allow editing a directory in file view

Is your feature request related to a problem? Please describe.

When hitting 'e' in files view to edit a directory, we get an error, although most editors today support opening a directory, for example netrw/oil in neo/vim

Describe the solution you'd like

When trying to edit a dir, it should open it in the editor defined in editPreset

Describe alternatives you've considered

What im doing today is editing a file under the directory and then going to directory view, but this is not ideal if the file is large or its a binary file as it will take time to open it

Additional context

Draft PR that implements the feature: https://github.com/jesseduffield/lazygit/pull/6057