Print max-task-limit flags in DesktopTasksController dumpsys.

- Add dumpsys for DesktopModeStatus, and trigger that from
DesktopTasksController.
- Add max-task-limit feature info to the DesktopModeStatus dump

The DesktopTasksController dumpsys state is added to the Android Bug
Tool under the view:

Bug >
APP SERVICES SERVICE >
com.android.systemui/.dump.SystemUIAuxiliaryDumpService >
com.android.systemui.wmshell.WMShell

Flag: com.android.window.flags.enable_desktop_windowing_mode
Bug: 355611890
Test: generated bugreport, checked with ABT
Change-Id: I8fa427aa12e722776ef89106edfe4a8ac06ff149