feature: Make menu items clickable

[traverseda]

Did you check the docs?

• [ ] I have read all the which-key.nvim docs

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

I sometimes need to use vim on my phone. This is generally a painful process, and probably always will be, but I think it would be slightly less painful if I could click on whichkey menu items.

Describe the solution you'd like

Make menu items click-able

Describe alternatives you've considered

It's not exactly an important feature, the alternative is just not implementing it, and everything will continue to work.

Additional context

No response