Go-ipfs: 'ipfs swarm peers' should print more info

[whyrusleeping]

I think it would be pretty helpful to have ipfs swarm peers have a verbose option that allows it to print out latency to each peer and also potentially 'last contact' with each peer.

[csasarak]

I am interested in getting involved with this project, if you think this is a good place for a new person to get involved I could help.

[Kubuxu]

It should be quite easy to do. I would encourage you to try.

A lot of issues are tagged with difficulty.

[csasarak]

Sounds good, I'll have a go.

[Kubuxu]

Resolved by #2713