Implement websocket based port-forward

[saschagrunert]

The goal is to add the logic for supporting websocket based port-forward connections:

conmon-rs/conmon-rs/server/src/streaming_server.rs

Line 581 in 5c4f960

"Requires SPDY protocol implementation from https://github.com/moby/spdystream"

Refers to kubernetes/enhancements#4006
Client side: https://github.com/kubernetes/kubernetes/tree/5a45088/staging/src/k8s.io/client-go/tools/portforward

[bitoku]

/assign

[bitoku]

https://kubernetes.slack.com/archives/C0EG7JC6T/p1752591805090699
Removing SPDY doesn't seem to happen soon.

I'll investigate https://docs.rs/h2/latest/h2/index.html and see if we can use it.
otherwise we may be able to use spdy C implementation like https://github.com/tatsuhiro-t/spdylay/tree/master

[saschagrunert]

Yes an external library could be a workaround here.