feat : Initial implementation Caddy (#5166)

- Introduced "Caddy" functionality to organize apps within the app drawer.
- Allows grouping of applications for better accessibility and user experience.
- Serves as a foundational feature for enhancing app drawer usability.

src/com/android/launcher3/folder/Folder.java

@@ -403,6 +403,8 @@ public class Folder extends AbstractFloatingView implements ClipPathView, DragSo
         if (dragObject.dragSource != this) {
             return;
         }
+        if (isInAppDrawer()) close(true);
+        
         mContent.removeItem(mCurrentDragView);
         mItemsInvalidated = true;
 
@@ -415,6 +417,10 @@ public class Folder extends AbstractFloatingView implements ClipPathView, DragSo
         mItemAddedBackToSelfViaIcon = false;
     }
 
+    public boolean isInAppDrawer() {
+        return mInfo.container == ItemInfo.NO_ID;
+    }
+
     @Override
     public void onDragEnd() {
         if (mIsExternalDrag && mIsDragInProgress) {
@@ -583,7 +589,7 @@ public class Folder extends AbstractFloatingView implements ClipPathView, DragSo
         }
         // In case any children didn't come across during loading, clean up the folder accordingly
         mFolderIcon.post(() -> {
-            if (getItemCount() <= 1) {
+            if (getItemCount() <= 1 && !isInAppDrawer()) {
                 replaceFolderWithFinalItem();
             }
         });
@@ -971,7 +977,7 @@ public class Folder extends AbstractFloatingView implements ClipPathView, DragSo
             mRearrangeOnClose = false;
         }
         if (getItemCount() <= 1) {
-            if (!mIsDragInProgress && !mSuppressFolderDeletion) {
+            if (!mIsDragInProgress && !mSuppressFolderDeletion && !isInAppDrawer()) {
                 replaceFolderWithFinalItem();
             } else if (mIsDragInProgress) {
                 mDeleteFolderOnDropCompleted = true;