Collapse private space container and animate header.

- Just opposite of how it will expand.
- RecyclerView.SmoothScroller is needed to scroll the container.

- Need to separate the lock button because this way I can use animateLayout changes and it itself was its own drawable. Separated into icon and textView in a viewGroup.
- Give the background the 10padding on the left and right so that when in animation, the icon can adjust the padding/margins there.
- Using propertySetter to set animation
- Animates the alpha of the settings alpha

- updated test to account for the nested child views the test needs to inspect

bug: 299294792
test: manual:
Expand + Collapse Video: https://drive.google.com/file/d/1Og66eqmXv3THn0wO4_x6Tfp2AbwFWUwZ/view?usp=sharing
Flag: ACONFIG com.android.launcher3.Flags.private_space_animation TEAMFOOD

Change-Id: I96f1d172a481522d23b4cee996ddec65961fce78

src/com/android/launcher3/allapps/BaseAllAppsAdapter.java

@@ -258,6 +258,7 @@ public abstract class BaseAllAppsAdapter<T extends Context & ActivityContext> ex
 
     @Override
     public void onBindViewHolder(ViewHolder holder, int position) {
+        holder.itemView.setVisibility(View.VISIBLE);
         switch (holder.getItemViewType()) {
             case VIEW_TYPE_ICON: {
                 AdapterItem adapterItem = mApps.getAdapterItems().get(position);