NIP-50: search by nip05 domain

[alexgleason]

Add a search extension to NIP-50 like domain:gleasonator.dev to include only events from users with a valid nip05 name on the domain gleasonator.dev

[nostr-wine]

We have recently started experimenting with event classification (https://docs.nostr.wine/api/classification) on our nostr.wine relay.

I'm not sure if this is the right place, but is this an opportunity to include a few additional search extensions for those? We'd love to find a way to make topic and other advanced search more accessible on clients. We were thinking topic, sentiment (negative, neutral, positive), language, and a nsfw boolean.

topic: - include only events within a classified topic (short string, one to two words?)
sentiment:<negative, neutral, or positive> - include only events of a specific sentiment
language:<two letter language code?> - include only events of a specified language
nsfw:<true/false> - include or exclude nsfw events

[fiatjaf]

Yes, I think we could include all these.

[alexgleason]

@nostr-wine Good idea. Let's open a separate PR for those.