List available relays

curl --request GET \
  --url https://relay.fluxer.app/v1/relays

{
  "relays": [
    {
      "id": "<string>",
      "name": "<string>",
      "url": "<string>",
      "latitude": 123,
      "longitude": 123,
      "region": "<string>",
      "capacity": 4503599627370495,
      "current_connections": 4503599627370495,
      "public_key": "<string>",
      "registered_at": "2023-11-07T05:31:56Z",
      "last_seen_at": "2023-11-07T05:31:56Z",
      "healthy": true
    }
  ],
  "count": 4503599627370495
}