Allow system organizer to watch additional config changes

System organizer may want to get TaskFragment info callbacks for some
configuration changes, e.g. Launcher wants UI mode change callbacks for
the TaskFragment.

Bug: 385676993
Test: WindowOrganizerTests TaskFragmentOrganizerControllerTest
Flag: EXEMPT bugfix
Change-Id: I493b1d908b89422cc55087da9e2319b366f6006a