Create a drag shadow surface in app process,

Previoulsy a drag shadow surface is created in the system process. App needs
to call one more binder call (prepareDrag) to obtain the surface from
the system process.

The CL lets an app to create a drag shadow surface by itself. Then app
transfer the surface to system server by using reparent
API.

Bug: 70818582
Test: com.android.server.wm.DragDropControllerTests,
      android.server.wm.CrossAppDragAndDropTests,
      manually check the drag and drop behavior on test app.
Change-Id: I72796efffbefe78a802d7c441dea308d1cdea572