New go-ipfs feature: ipfs swarm list connections

[daviddias]

We need to upgrade the swarm API implementation to follow: ipfs/kubo#3352

[Kubuxu]

It should be possible to support both the old and new api by detecting the type of call result.

[whyrusleeping]

@Kubuxu Yeah, thats what i'm doing on the go side right now, basically just checking whats in the json map that gets returned

[daviddias]

done in #427