Use a new controller for each iteration of a long-lived registration.

This CL introduces a controller factory that users must use for
long-lived registrations, thus enforcing the assumption that each
controller will actually run at most once.

Bug: 202516970
Flag: com.android.systemui.shared.return_animation_framework_library
Flag: com.android.systemui.shared.return_animation_framework_long_lived
Test: atest ActivityTransitionAnimatorTest
Change-Id: Icb9c0d32557d086c485b31fa98d71ea9ad42d147