Let Launcher able to receive task launching callback(3/N)

When StartingWindowController receive addStartingWindow, send a callback
out so a listener can know whether current launch cold or warm.

Ref doc: go/starting_window_android_s

Bug: 131311659
Bug: 131727939
Bug: 152480470

Test: atest WindowOrganizerTests StartingSurfaceDrawerTests
SplashscreenTests

Change-Id: Ic9f02f51d5de141b56a8f28003bf1cb1a5a63f22