Log event when dragging bubble bar left or right

Bug: 349845968
Test: atest BubbleBarLayerViewTest
Test: atest BubbleExpandedViewPinControllerTest
Test: drag expanded view to other side and release, check that drag
  event is logged
Test: drag expanded view to other side, back and release, check that
  drag event is not logged as location did not change

Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: I12947d8f93aa727db993a3049544686be9b4dd4f