Rework InputApplicationInfo

First we move it inside of InputWindowInfo instead of InputWindowHandle
so it is part of the data sent across binder. Second we give it a persistent
identity of an IBinder token and use this for comparisons.

Bug: 80101428
Bug: 113136004
Bug: 111440400
Test: EndToEndNativeInputTest. Existing tests pass.
Change-Id: Id89a40e66887d834020f8e645fd1fb48adb7ee2e