Support Webtransport

[Craigzyc]

Is your feature request related to a problem? Please describe.
I'm having issues with websockets being blocked a fair bit. Adding webtransport would give an alternative connection method to try

Describe the solution you'd like
Add webtransport, similar to how socket.io has just done

Describe alternatives you've considered
We have tried everything else we can to fix this one these limited corporate networks but its always a hassle if it can be fixed

Additional context
https://developer.mozilla.org/en-US/docs/Web/API/WebTransport

[CendioOssman]

I'm not sure WebTransport would be a good solution for that issue. It's even more exotic than WebSocket, and even requires HTTP/3 which doesn't even use TCP.

It's something we could consider adding in the future, but it looks a bit fresh at the moment. It's not supported by Safari, or Firefox ESR yet.