Make public addresses go first in authority discovery DHT records (#3757)

Make sure explicitly set by the operator public addresses go first in
the authority discovery DHT records.

Also update `Discovery` behavior to eliminate duplicates in the returned
addresses.

This PR should improve situation with
https://github.com/paritytech/polkadot-sdk/issues/3519.

Obsoletes https://github.com/paritytech/polkadot-sdk/pull/3657.

Cargo.lock

@@ -15555,6 +15555,7 @@ dependencies = [
  "futures-timer",
  "ip_network",
  "libp2p",
+ "linked_hash_set",
  "log",
  "multihash 0.18.1",
  "multihash-codetable",