WebTransport Support

[ugran]

Hello,

First of all, Thanks for the great package ❤️

Would it be possible to add support for the webtransport protocol?

Socket.io has recently added support for it in 4.7 release.

[ugran]

@jumperchen I can write rust webtransport port with https://github.com/fzyzcjy/flutter_rust_bridge , if you'll be ok with using it.

[jumperchen]

@ugran it seems Dart doesn't support this feature, so I prefer to wait for them to support it first.