code: protected final ClientBuilder newClientBuilder(String uri, Consumer<ClientBuilder> customizer) {
          final ClientBuilder builder = new ClientBuilder(uri);
          customizer.accept(builder);
          clientConfigurator.configure(builder);
          builder.factory(clientFactory());
          return builder;
      }
docs: Returns a newly created {@link ClientBuilder} configured with the specified {@code customizer}
  and then with the {@link ArmeriaClientConfigurator} specified with
  {@link #clientConfigurator(ArmeriaClientConfigurator)}.