[Feature request] Grid view for artists

[jesuscc1993]

[ ] Regression 
[ ] Bug report  
[x] Feature request

Currently, the app lists the artists on a sidebar. This limits the amount shown at a time at ~20 and makes browsing extremely inefficient.
It would make more sense to display them in a grid view, in the center of the screen, which is able to comfortably display 50 at once.
Space aside, it would also make more sense to display them in the center as this is the artists tab and they should be the focus of the screen, contrary to the current state where the focus appears to be the albums view (and there already is a tab for albums so this is completely redundant).

For reference:

(Copied from feature request #1337 on the dopamine-windows version).