Adds the ScreenOffAnimationController, which fixes multiple issues with unlocked screen off.

This changes the screen off animation so that the controller directly animates the LightRevealScrim and the shade keyguard UI, rather then tying these to the dozeAmount. This makes it easier for us to manage/cancel these animations, such as during the camera launch gesture, since the various doze components update their state asynchronously.

This approach also means that instead of actually changing everything to KEYGUARD as soon as the power button is pressed, we actually just show the LightRevealScrim and the shade's AOD UI. This results in far less jank. We then actually show the keyguard once the animation finishes or is cancelled.

Bug: 169693662
Bug: 169739682
Bug: 181020504
Fixes: 185567665
Fixes: 189342687
Fixes: 185567665
Fixes: 183195436
Test: atest SystemUITests
Test: trigger screen off and cancel it
Test: trigger screen off and don't cancel it, make sure it wakes up fine
Test: disable 'power button locks instantly' and make sure it doesn't lock the device, both when the animation finishes or when it's cancelled
Test: press the power button twice in rapid succession
Test: press the power button twice in slower succession about 200ms apart (which triggers the camera onWakingUp vs onFinishedGoingToSleep)
Test: press the power button 5 times, make sure emergency gesture comes up
Test: disable AOD, observe no screen off animation and lock functionality works
Change-Id: I1c44304becdadfd37bab7fd81286a9702e5d6141