Fix a11y navigation in Chooser

With the `ResolverDrawerLayout`-`RecylerView` combination it was
possibel for accessibility navigation to get off-screen.
The issue is addressed by adding a custom accessibility delegate to the
recycler view which makes sure that an item receving accessibility focus
becomes visible.

Bug: 230132993

Test: Manueal - user accessibility navigation on the Chooser with a long list of
apps; make sure that items that receive a11y focus become visible when
scrollng in both directions.

Change-Id: I448d88660f701ca3c5ea0c92416595c9389af521