Improve use of relays

[staab]

https://nostrdesign.org/docs/how-to/relays/

• [ ] Allow white/black listing relays
• [ ] Enable/disable auth per relay
• [ ] Allow users to pick what relays can be used for (dms/notifications/feed)
• [ ] Relays in common
• [ ] Tools for discovering relays based on policy or social graph
• [x] Switch between 04/17 based on 10050 notes being published. https://github.com/nostr-protocol/nips/pull/1197
• [ ] Use proxy and broadcasting relay lists https://github.com/nostr-protocol/nips/pull/1303
• [ ] Draft a nip for relay types https://github.com/nostr-protocol/nips/discussions/1301#discussioncomment-9744095

Supersedes https://github.com/coracle-social/coracle/issues/129