Adding logging to NotificationShadeWindowController

- adding ShadeWindowLogger using LogBuffer
- adding interface for all loggers wanting to log simple constant strings: ConstantStringsLogger
- adding default implementation of ConstantStringsLogger which can be used easily in Kotlin and using it in other loggers
- moving mForceOpenTokens from NotificationShadeWindowController to its State

Test: logging works
Bug: 245441667
Change-Id: Ic7c3b553c6388982bbc50b34a99a26de9f5e0d86