Change visible-requested updates to "push" model

We do many more queries of isVisibleRequested than we
do sets. Since queries above WindowToken level have to
walk the full subtree, it can waste time. Instead, just
keep track of visibleRequested on all containers and
update it when they change.

Bug: 260059642
Test: atest ActivityVisibilityTests TaskTests
Change-Id: Ied56accea568bb848d38fd77b1b8de47949cd212