hjkl navigation in pickers

[theherk]

I didn't see an issue for this, and I didn't see it mentioned in #165. It would be nice if you could use C-j and C-k for navigation down and up respectively in the picker interfaces. For example, in the Command Palette, after typing "extend", it would be nice to have access to C-j C-j to reach "Extend selection to line bounds".

Such navigation would be nice in any panel where selection is done via arrow keys. Is this already possible? If so, it would still be nice out-of-the-box, since it currently just types a lowercase j and ignores the ctrl input.

[the-mikedavis]

C-j and C-k used to exist for the picker but were removed: #1792

Now you can use C-n and C-p to go to next and previous items in the picker. I think #2757 is a good way to cover this.

[theherk]

Oh sweet! I can survive n and p until remapping is available. At least, I don't think I'll break any fingers.