docs: public ViewTransitionBuilder animator(@NonNull final Animator animator) {
          addSetup(new ViewTransition.Setup() {
              @Override
              public void setupAnimation(@NonNull final TransitionControllerManager manager) {
                  Animator animator2 = animator.clone();
                  if (animator2 instanceof AnimatorSet) {
                      manager.addTransitionController(DefaultTransitionController.wrapAnimatorSet((AnimatorSet) animator2));
                  } else {
                      manager.addTransitionController(DefaultTransitionController.wrapAnimator(animator2));
                  }
              }
          });
          return self();
      }