see `MG_SOCK_STRINGIFY_*` definitions.- MG_SOCK_STRINGIFY_IP - print IP address- MG_SOCK_STRINGIFY_PORT - print port number- MG_SOCK_STRINGIFY_REMOTE - print remote peer's IP/port, not local addressIf both port number and IP address are printed, they are separated by `:`.If compiled with `-DMG_ENABLE_IPV6`, IPv6 addresses are supported.