prs on Nostr: Profiles in nostrdb (#1520) This adds profiles to nostrdb and replaces our in-memory ...

Profiles in nostrdb (#1520)

This adds profiles to nostrdb and replaces our in-memory and ProfileDatabase cache with it

- Remove in-memory Profiles caches, nostrdb is as fast as an in-memory cache
- Remove ProfileDatabase and just use nostrdb directly

## TODO

- [ ] cache lnurl properly
- [ ] add database versions for migrations

nostrdb-profiles, 5 commits

https://github.com/damus-io/damus/pull/1520