Add support for API version 7

The `codes` data in `responses` for each HTTP [upstream](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_upstream), [server zone](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_server_zone), and [location zone](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_location_zone) were added