Add window decor logs and dump state

To help investigate missing App Headers / decorations.

Flag: EXEMPT adding logs
Bug: 413375299
Bug: 415096258
Test: logcat -s ShellWindowDecoration:*
Test: dumpsys | grep DesktopModeWindowDecorViewModel -A 50
Change-Id: I621589f63870034f5667df9a7c97305a26f2cc1f