Add a Nostr relay

Alex Gleasonrequested to merge
relay into develop

Adds a Nostr relay on /relay. So people can connect to wss://yoursite.com/relay

This will allow users who prefer Nostr clients to use Ditto directly with a Nostr client, and still get all the benefits of Ditto. It also lets me more easily test the Ditto database.

Streaming is not yet supported.

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