fix: like/ilike not showing up on string calculations (#369)

Author: jsw800

lib/resource/resource.ex

@@ -2904,6 +2904,7 @@ defmodule AshGraphql.Resource do
 
       filter_fields =
         Ash.Filter.builtin_operators()
+        |> Enum.concat(Ash.DataLayer.functions(resource))
         |> Enum.filter(& &1.predicate?())
         |> restrict_for_lists(field_type)
         |> Enum.flat_map(