Changes to List segments

added the optional property data/items/total_count to the response with the 200 status

added the new forbidden enum value to the error/code response property for the response status 401

added the new forbidden enum value to the error/code response property for the response status 403

added the new forbidden enum value to the error/code response property for the response status 429

added the new segment_builder_required enum value to the error/code response property for the response status 401

added the new segment_builder_required enum value to the error/code response property for the response status 403

added the new segment_builder_required enum value to the error/code response property for the response status 429

endpoint added