[BottomSheet] Make behavior_draggableOnNestedScroll public

Author: pubiqq

lib/java/com/google/android/material/bottomsheet/res-public/values/public.xml

@@ -30,6 +30,7 @@
   <public name="Widget.Design.BottomSheet.Modal" type="style"/>
   <public name="Widget.MaterialComponents.BottomSheet" type="style"/>
   <public name="Widget.MaterialComponents.BottomSheet.Modal" type="style"/>
+  <public name="behavior_draggableOnNestedScroll" type="attr"/>
   <public name="behavior_expandedOffset" type="attr"/>
   <public name="behavior_halfExpandedRatio" type="attr"/>
   <public name="behavior_hideable" type="attr"/>