wip WebTransport socket backend

[inolen]

I wanted to update https://quakejs.com to use the new WebTransport APIs, in order to finally get away from tunneling UDP over TCP. Tunneling over TCP was interesting when I first wrote it, but it always felt like a novelty as it wasn't enjoyable to play on, unlike WebTransport.

Some notes -

1. Node has some amount of support natively for QUIC, however, this PR currently still relies on two external packages to provide full QUIC / HTTP3 support.
2. Testing this is a pain. I failed at getting Firefox / Chrome to work correctly with my self-generated certs, and ended up just generating a cert for a domain I owned and debugging remotely.
3. I didn't implement support for TCP sockets because of the testing part, so this is purely for UDP sockets right now.

This is currently running on https://quakejs.com, but given the lack of testing and relying on external libraries I don't think it's appropriate to merge. However, I wanted to get feedback and put it out there in case anyone else was also interested in working with the new WebTransport APIs.