Introduce BAL Configuration object

This introduces a configuration object for BAL, so we don't have to touch
WindowProcessController each time there is a change to the configuration
parameters passed to the BAL checks in BackgroundLaunchProcessController
(e.g. adding checkVisibility).
For the hot path this will be a constant and should therefore not
introduce significant overhead.
There is no logic change in this CL, it is pure refactoring (even so it
already introduces configs to select visibility/other checks, which will
be used in a follow up.

Flag: EXEMPT refactor
Bug: 352182359
Test: atest BackgroundLaunchProcessControllerTests
Change-Id: I5740fea0078f2eb7e4854f45aece3d2cf23d73ed