Show standard unchanged bindings

[rwijtvliet]

(Excuse me if this is not the correct place for this discussion, or if it's actually already possible. In that case, I didn't find, how.)

For someone new to vim/neovim, it'd be very beneficial if WhichKey did not only show the user/plugin-defined key bindings, but also the standard vim key bindings. I'm aware this would make the popup have rather many items, but it'd be a great way to learn more quickly.