Implement an hydra-like or transient-like interface

[Sasanidas]

So, the idea is to implement hydra (https://github.com/abo-abo/hydra) interface or transient(https://github.com/magit/transient) so that more complex command can be split to multiple screens.

[appetrosyan]

I'd think it's going to be very useful for discoverability. And it would also allow one to implement the equivalent of magit.