Implement touch through on InsertionHandleView.

So that the logic of double-tap & long-press to select words can be shared to InsertionHandleView.
Note:
  - This requires to work with the cursor dragging feature, otherwise the InsertionHandleView cannot move.
  - InsertionHandleView needs to handle touch up events to toggle the insertion menu as expected.
  - The event coordinates need to be modified in order to make the touches on handle equivalent to touches on text at cursor.

Bug: 145547052,145535934
Test: m -j & manual test & automated tests
        atest frameworksCoreTests:EditorCursorDragTest
        atest FrameworksCoreTests:TextViewActivityTest
Change-Id: Ic025700eb06addd67a2abcfff97eaf0e8a196718