Add a resource override for providing default widgets filter.

The implementation in this CL is no-op i.e. all widgets will be shown

Bug: 356127021
Flag: com.android.launcher3.enable_tiered_widgets_by_default_in_picker
Test: Verified with other child cls
Change-Id: I0a6f8973dc8ec58fd87d29b3f291b5e290ea988d