feat(EDT): Migrate entry into Display Settings

The EDT toggle will be an subsetting in the DarkTheme settings page
- When the Dark Theme main toggle is on, we check the EDT setting to
decide applying normal DarkTheme or EDT now.
- The EDT preference is disabled when DarkTheme is off

Bug: 368721320
Flag: android.view.accessibility.force_invert_color
Test: atest ToggleForceInvertPreferenceControllerTest
            DarkModeSettingsFragmentTest
Change-Id: I64e47f92b14ee24a91f469cb55c7bb1285f05c62