Added app context to smart screen brightness.

Smart screen brightness learns the user brightness preferences from
user interactions with the brightness slider, but doesn't take into
account the foreground app's package name or category.
This CL adds:
- A BrightnessCorrection class,
- A mapping of package names and categories to brightness corrections
  in the BrightnessConfiguration,
- Tracking of the foreground app's package name and category in the
  AutomaticBrightnessController,
- Brightness correction depending on the foreground app's package
  name and category in the BrightnessMappingStrategy.

Test: manual - force turbo app to learn brightness preferences for
      specific packages/categories and see that they are applied.

      To make sure package/category switches are handled correctly,
      you can actually hardcode corrections and simulate edge cases
      such as rapid switches, multiple windows, etc.

Fixes: 111425369

Change-Id: Ic9516c75dbf63ea21f0ae780f9c35e8c85dbbe5b