made a draft to extend nip56, would appreciate feedback or imrovements.

The logic is that clients can start off users with a whitelist of auto preview domains, but that kind of data can also exist on relays for other users/clients to make decisions from.

```

{

"kind": 10099,

"content": "",

"tags": [

["d", "domain_lists"], // identifier

["white", "nostr.build"],

["white", "void.cat"],

["black", "malicious-site.net"],

["black", "scam-domain.com"]

["unknown", "ask"] // Options: "load" | "block" | "ask"

]

}

```