1. Separate "Keyboard" from "Language & input".
2. Use FeatureFlagUtils.SETTINGS_NEW_KEYBOARD_UI to control the
different UI until Settings launches the new UI design.
Bug: 242680328
Test: local test
Change-Id: Id1ea6d3e3c2e6b83bc4b4d835c6b27e31311c530
- It can improve performance because we use less injected item
- Also remove summary provider from those fragments
Bug: 141653158
Test: robolectric
Change-Id: I6255f71b3b8300aea064a4fefd6711c1ff59e08a