webrtc: private/browser-to-private/server

[p-shahi]

eta: 2023-09-30

This is the browser side implementation in go-libp2p (a scenario where the go-libp2p node is in a private network e.g. behind a NAT/firewall). It is required for a browser node to hole punch to a private non-browser node and will “complete” the browser connectivity story.

Done Criteria

• Implement webrtcprivate Transport(webrtcprivate: add transport #2576)
• Swarm changes for dialing /webrtc(webrtcprivate: add transport #2576)
• API Interface for Configuring STUN Servers(webrtcprivate: add transport #2576)
• Interoperability tests in libp2p/test-plans (interop: run for /webrtc  #2584)
• Handle dialing /webrtc when peer supports DCUtR (interop: run for /webrtc  #2584)
• Autorelay changes to obtain a relay reservation with a browser supported transport

[p-shahi]

Status update: @ckousik will start on this feature now, as most of the work on js-libp2p-webrtc browser-to-browser is complete (minus the potential multiaddr name change)
@ckousik @ddimaria please use this ticket to capture the work-plan/todos

[ddimaria]

@p-shahi working branch for this work: https://github.com/ckousik/go-libp2p/tree/ckousik/webrtc-m3