pub fn build_chain_executor(
tls_override: Option<&Arc<ClientConfig>>,
shadowsocks_metrics: Option<Arc<ShadowsocksMetrics>>,
) -> ChainExecutorpub fn build_chain_executor(
tls_override: Option<&Arc<ClientConfig>>,
shadowsocks_metrics: Option<Arc<ShadowsocksMetrics>>,
) -> ChainExecutor