Function iroh_mainline_content_discovery::announce_dht

pub fn announce_dht(
    dht: Dht,
    content: BTreeSet<HashAndFormat>,
    port: u16,
    announce_parallelism: usize
) -> impl Stream<Item = (HashAndFormat, Result<StoreQueryMetdata>)>

Announce to the mainline DHT in parallel.

Note that this should only be called from a publicly reachable node, where port is the port on which the tracker protocol is reachable.