feat(A11yFeedback): Pixel overlay to expose the feedback bucket ID

This change introduces a feature provider for Pixel overlays, allowing
customization of the feedback bucket ID on Android.

Bug: 393980229
Test: Manual testing for Pixel and non-Pixel overlay in real device
Test: atest AccessibilitySettingsTest
            FeedbackManagerTest
Flag: com.android.server.accessibility.enable_low_vision_generic_feedback
Change-Id: Ieeb1dba4de5c13a275e66781621cbfcca7219a5e