fn with_context(context: ServiceContext, svr_cfg: ServerConfig) -> Self {
        Self {
            context,
            svr_cfg,
            udp_expiry_duration: None,
            udp_capacity: None,
            manager_addr: None,
            accept_opts: AcceptOpts::default(),
        }
    }
Create a new server builder with context
crates/shadowsocks-service/src/server/server.rs