Add taskbar TAPL tests

- Added TAPL objects to support TAPL tests for taskbar features
- Added tests for major taskbar features: hiding/showing the taskbar, opening all apps, lauching apps and app deep shortcuts from the taskbar/all apps page, launching apps and app deep shortcuts in splitscreen
- These tests should only run for large devices

Design: go/taskbar-tapl-tests
Test: ran tests locally with invalid configurations and remotely
Bug: 215218813
Change-Id: I3c28c339707467414aa47fa633f87fa0c1fdee57

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

@@ -145,6 +145,7 @@ public class TaskbarPopupController implements TaskbarControllers.LoggableTaskba
                 });
         // TODO (b/198438631): configure for taskbar/context
         container.setPopupItemDragHandler(new TaskbarPopupItemDragHandler());
+        mControllers.taskbarDragController.addDragListener(container);
 
         container.populateAndShow(icon,
                 mPopupDataProvider.getShortcutCountForItem(item),