Seperate SettingsConfigProvider into producers.

This provides a clear separation between the data producing classes and
the core library class. It also allows seperating the logic in
SettingsConfigProvider into different producers that provide their data
from different sources (for ex, settings vs resources).

Bug: 173428759
Test: Manual - flash device and verify
Test: ./gradlew window:window:test

Change-Id: I111058ff7c3479bc53aede0b29de1e2e1c2ff91f