Support splitting task limit minimize Change into its own transition

Before this CL we would add minimize changes to existing app launch
transitions through DTC#handleRequest(). With this CL we add support in
DesktopTasksLimiter to use runOnIdle() (called from onTransitionReady())
to check whether to launch a new minimize transition.
The benefit of using runOnIdle() instead of handleRequest() is that in
runOnIdle() we have information about all the collected Changes in the
transition so we can make a more informed decision on whether to
minimize. This new approach supports edge-cases such as launching task
trampolines and opening a new tab in Chrome.

Also support adding a start-delay to task limit minimize animations
through the property
"persist.wm.debug.desktop_transitions.minimize.start_delay_ms"

Bug: 404549853
Bug: 356337427
Flag: com.android.window.flags.enable_desktop_task_limit_separate_transition
Test: DesktopTasksLimiterTest, DesktopMixedTransitionHandlerTest
Change-Id: I47c035c260aab9146988031f6c1b872ddd4369c6