Add Websocket support to ServerMiddlewareBuilder

[max-peroch]

Hello,

I'm trying to wire the ServerMiddlewareBuilder into my EmberServerBuilder mostly following this example: https://github.com/http4s/http4s-otel4s-middleware/blob/main/examples/src/main/scala/example/Http4sExample.scala

My issue is that I have a WS endpoint and I'm confused as to how it would work when using .withHttpWebSocketApp(...) instead of withHttpApp(...). It doesn't seem possible at the moment, right?

Thanks