Allow other network protocols for communication with services inside sandbox

[mlejva]

Users can use only the HTTP protocol when communicating with services they started inside the sandbox. This for example prevents users from communicating with a service they started inside their sandbox using WebSocket.

As far as I know, the biggest blocker in our infra at the moment is a setup of our network proxies. We could explore moving our network proxies to Layer 4 (TCP/UDP) which could enable every protocol out of the box.

Not only this would allow other protocols like Websockets but also for example running GUI applications and streaming graphics with the VNC protocol - important for AI agents that need to control apps and also for communicating what's happening to users.