static WebSocketClient of(Scheme scheme, EndpointGroup endpointGroup) {
        return builder(scheme, endpointGroup).build();
    }
Returns a new {@link WebSocketClient} that connects to the specified {@link EndpointGroup} with
the specified {@link Scheme} using the default {@link ClientOptions}.
core/src/main/java/com/linecorp/armeria/client/websocket/WebSocketClient.java