Desktop Mode Taskbar Recreate Animation

This Cl includes
       - addition of entry/exit callback methods in DesktopVisibilityController.
       - taskbar manager now listens to desktop mode changes.
       - TaskbarBackrgroundRedererer can now individually animation backgrounds for transient and persistent taskbars
       - new channel for taskbar icon alpha added to TaskbarViewController
       - new animated float to handle background alpha while we are recreating taskbar with animation.

Solution:

we use the callabck we get from DekstopVisibilty for entry/exit to first change logic of when we are considered inDesktopMode. Upon entry/exit we notify display controller for info change.
we also at notify taskbar manager who is now a listener to the desktop mode change and start the recreate process. TaskbarManager first animates existing taskbar out of user view and then follows the original recreate flow.

Test: Presubmit
Bug: 343882478
Flag: com.android.window.flags.enable_desktop_windowing_mode
Change-Id: Ib827564cacd194f499e7d9b1965e2bb13e3548ab

quickstep/src/com/android/launcher3/taskbar/TaskbarControllers.java

@@ -15,6 +15,7 @@
  */
 package com.android.launcher3.taskbar;
 
+import android.animation.AnimatorSet;
 import android.content.pm.ActivityInfo.Config;
 
 import androidx.annotation.NonNull;
@@ -149,15 +150,15 @@ public class TaskbarControllers {
      * TaskbarControllers instance, but should be careful to only access things that were created
      * in constructors for now, as some controllers may still be waiting for init().
      */
-    public void init(@NonNull TaskbarSharedState sharedState) {
+    public void init(@NonNull TaskbarSharedState sharedState, AnimatorSet startAnimation) {
         mAreAllControllersInitialized = false;
         mSharedState = sharedState;
 
         taskbarDragController.init(this);
         navbarButtonsViewController.init(this);
         rotationButtonController.init();
-        taskbarDragLayerController.init(this);
-        taskbarViewController.init(this);
+        taskbarDragLayerController.init(this, startAnimation);
+        taskbarViewController.init(this, startAnimation);
         taskbarScrimViewController.init(this);
         taskbarUnfoldAnimationController.init(this);
         taskbarKeyguardController.init(navbarButtonsViewController);