swarm: add mock net.PacketConn for testing #2443
Draft
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This uses https://github.com/tailscale/tailscale/tree/main/tstest/natlab
to provide a mock net.PacketConn. This allows us to fake quic addresses
on nodes to test for address discovery. This can also be used to test
nat traversal.
Update 2023-09-25: We do need this but I'll pick this up some time next month. Converting it to draft.