Remane shouldExtendLifetime to meaningful maybeExtendLifetime

...ui/statusbar/notification/collection/NotifCollection.java

...ar/notification/collection/coordinator/GutsCoordinator.kt

...tification/collection/coordinator/HeadsUpCoordinator.java

...ion/collection/notifcollection/NotifLifetimeExtender.java

...ollection/notifcollection/SelfTrackingLifetimeExtender.kt

...tatusbar/notification/collection/NotifCollectionTest.java

...otification/collection/coordinator/GutsCoordinatorTest.kt

...cation/collection/coordinator/HeadsUpCoordinatorTest.java

...tion/collection/coordinator/RemoteInputCoordinatorTest.kt

...ction/notifcollection/SelfTrackingLifetimeExtenderTest.kt