Implementation of DNS Support

[daviddias]

Created this issue to track the implementation of DNS support in JS and throughout js-libp2p and js-ipfs

Given multiformats/multiaddr#22 (comment), we need:

• Add support for the DNS code in js-multiaddr
  • .isName method - check if the multiaddr is a name DNS multiaddrs support #39
  • .resolve method - resolve the name, if it is a name Needs more consideration, not necessary right now
  • update js-mafmt to for libp2p-webrtc-star to understand that dns is also valid option feat/update webrtc star with dns support js-mafmt#12
• libp2p-webrtc-star + DNS
  • Migrate libp2p-webrtc-star signalling to use DNS instead
  • Put a libp2p-webrtc-star signalling behind DNS and a reverse proxy with TLS @lgierth
  • Get @lgierth to get a cert for signal.libp2p.io
  • Ensure that it is all good in apps loaded behind https
• Migrate repo/.config to have:
  • libp2p key to isolate all libp2p config specifically
  • addrs to listen (listen)
  • addrs to announce (broadcast)
  • addrs to not announce (filter)
  • Add these distinctions to the peerInfo object too
• Test that a js-ipfs node can dial do a node behind DNS
  • Deploy a node using the dokku thing
  • Test it out
  • Ensure that Identify sends the right addrs

[daviddias]

@lgierth it is time to get that Certificate :)

[daviddias]

Continues on ipfs/js-ipfs#739