Integration with libp2p and/or bifrost

[paralin]

norouter is really cool, the idea of forwarding IP traffic via a stdin/stdout "exec" session is great.

I see a few ways my project Bifrost and libp2p could improve norouter and vise-versa:

• Bifrost defines a Transport interface and a common Quic transport over a io.Reader/io.Writer or a net.Listener.
• Norouter can pass the "exec" session read/writer to the Quic constructor to make a Transport.
• Bifrost can then be dynamically configured to listen on local ports & forward traffic via norouter.
• Multiple transports can be used simultaneously & Bifrost will balance traffic over them.
• Other logic like connection management and on-demand conns is then implemented "for free"

There's then a very modular / easy way to then swap norouter out for a more production grade transport like direct UDP connections w/ k8s DNS resolution later on, without changing any app code.

Would love to hear your thoughts on this @AkihiroSuda

[AkihiroSuda]

Feel free to open pull requests 🙂 (any change needed on norouter side?)

[paralin]

I'll prototype a transport :)