[FEATURE REQUEST] Grab focus without raising the window

[BrodieRobertson]

Continuing on from a discussion in pop-os/cosmic-settings#566

Currently when a window is given focus that window is placed above all of the other windows, this makes sense for dialogs and other such windows that demand focus but for many others can be quite disruptive if you tend to overlap windows, especially so when using focus follows cursor. KDE Plasma and a lot of window managers addresses this by allowing the user to separate focus and window raising into 2 separate actions if they desire.

As an example, in this video the window with the red border currently has focus, I have it so window raise only occurs after you click on a window.

focus-raise.mp4