feat(A11yHaTS): Add entrypoint for force invert

Visibility is controlled by the aconfig flag and
SurveyFeatureProvider#isSurveyAvailable, and these can be changed by
force invert features.

Bug: 380346799
Test: Manual testing on Pixel and non-Pixel devices
Test: atest BaseSupportFragmentTest
Flag: com.android.server.accessibility.enable_low_vision_hats
Change-Id: Ic7ea58141d212aa09b9fa29dc8267b32d20100e9