refactor: Modify ToggleColorInversionPreferenceFragment to plain

xml/PreferenceController style

- Modify the xml so it's easier to glance what's included in this
  fragment
- Add preference controllers for each preference item
- Update the fragment test to be closer to integration test that could
  be used to verify the user interactions

Test: com.android.settings.accessibility
Test: manually verify the user interactions and UI on the screens
Bug: 406052931
Flag: EXEMPT risk taken (it would be cleaner for refactor without
feature flagging)

Change-Id: Id9f7a69a27472a9a972de7081c33817422d319e6