Refactor all apps to depend on activity context.

The current AllAppsContainerView has been split into a base class and a
subclass for activities. The base class allows using all apps with an
activity context. A-Z and work profile tabs are supported, but search
and the hotseat still require an Activity.

Test: Manual. All apps should work the same.
Bug: 204696617
Change-Id: I3b146714bc11b3b3555d97623aab5d78ac836482