Function iroh_mainline_content_discovery::query_dht

pub fn query_dht(
    endpoint: impl QuinnConnectionProvider<SocketAddr>,
    dht: Dht,
    args: Query,
    query_parallelism: usize
) -> impl Stream<Item = Result<SignedAnnounce>>

Query the mainline DHT for trackers for the given content, then query each tracker for peers.