Double tap to sleep in keyguard

With "config_supportDoubleTapSleep" enabled and user setting
Settings.Secure.DOUBLE_TAP_TO_SLEEP enabled, a double tap gesture in
any non-action areas of the lock screen will put the device to sleep.

Bug: 394952486
Test: atest SystemUiRoboTests:TouchHandlingViewInteractionHandlerTest
Test: atest SystemUiRoboTests:KeyguardTouchHandlingInteractorTest
Test: manual - tested on local device by double tapping in the lock
screen with the user setting enabled/disabled only when config is
enabled
Flag: com.android.systemui.double_tap_to_sleep

Change-Id: If0e221bd3b8a1015dad5cccea720e54a2ee4a358