Turn off launch adjacent behavior when on desktop

When user is on the desktop, and a new window of an app is created using
launch adjacent, it should open as another window. And not in split
screen.
Use LaunchAdjacentController to coordinate between desktop and split
screen. When on desktop, desktop controller disables launch adjacent.
When not on desktop, launch adjacent is enabled.
Split controller registers its container with the launch adjacent
controller so it can be restored as needed.

Test: atest DesktopTasksController
Test: open chrome in fullscreen, from menu choose new window, observe
  that the window opens in split screen
Test: open chrome in freeform, from menu choose new window, observe that
  a new freeform window is created

Bug: 279585872
Change-Id: If5199a8e5b59b313828061a3164f9880e033a9b3