Changes to Get best listings by collection

the response property listings/items/allOf[subschema #2]/order_created_at became nullable for the status 200

the response property listings/items/allOf[subschema #2]/protocol_data/signature became nullable for the status 200

the response property next became nullable for the status 200

the listings/items/allOf[subschema #2]/asset response's property type changed from object to no type for status 200

removed the required property listings/items/allOf[subschema #2]/asset/contract from the response with the 200 status

removed the optional property listings/items/allOf[subschema #2]/asset/identifier from the response with the 200 status

added the media type */* for the response with the status 400

added the media type */* for the response with the status 404

added the non-success response with the status 503

added the optional property code to the response with the 401 status

added the optional property code to the response with the 403 status

added the optional property code to the response with the 409 status

added the optional property listings/items/allOf[subschema #2]/price_per_item to the response with the 200 status

added the optional property listings/items/allOf[subschema #2]/protocol to the response with the 200 status

added the optional property listings/items/allOf[subschema #2]/svm_order to the response with the 200 status

added OrderAsset subschema #2 to the listings/items/allOf[subschema #2]/asset response property anyOf list for the response status 200