Support Webtransport

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