Improve collection navigation with keyboard shortcuts

[SimonMayerhofer]

Is your feature request related to a problem? Please describe.
I love using the CMD+[1-9] to paste. But I also use my collections a lot. Currently only possible to iterate through the collections with predefined shortcuts, which have issues though (#66).
Navigating through the collections is currently more comfortable for me with using the mouse only, because I don't need to move my right hand to my keyboard.

Describe the solution you'd like
Beeing able to define a hotkey which allows to switch through the collections like with CMD+[1-9].

I use karabiner elements to map my Caps Lock key to CMD+ALT+CTRL+SHIFT. So if I could define that as the hotkey to press Caps Lock key + [1-9] to select the 1st-9th collection would be awesome. (1st collection would be the history, though)