Expose flags for tests

Expose the following flags:
- IsTouchable
- IsFocusable
- IsPreventSplitting
- IsDuplicateTouchToWallpaper
- IsWatchOutsideTouch
This is useful to check whether the corresponding flags are set during
tests.

Bug: 308487641
Test: atest CtsWindowManagerDeviceWindow:WindowInputTests

Change-Id: Ie16c05ad2b28a260f9a67f588c532ef9630f0163