Ability to enter deep Doze immediately in Battery saver.

This is disabled by default and leaves time (1 min) for processes to
finish running only if there are processes currently running, otherwise,
it goes into deep doze immediately.

Bug: 79955941
Bug: 109934270
Test: Turn on Battery Saver, enable quick doze feature, turn off screen
also run `atest BatterySaverPolicyTest`
also run `atest com.android.server.DeviceIdleControllerTest`
Change-Id: Iec0c8436134e18debfa4c71a8322a6c9cdb10846