Authentication of PeerIds in authority discovery records (#10317)

* Consolidating test and production code

* Signing/verifying authority discovery records with PeerId

Unsigned records cannot be rejected yet, they just produce
a warning in the log.

* Upgrading to libp2p 0.40

* libp2p::identity and sp_core::crypto Ed25519 are compatible

* Rejecting authority records unsigned by peer id can be configured

* Fixes based on review comments

* No command-line argument needed

* info was still too much spam in the logs

* Added tests for both strict and loose validation

* Fixing based on review comments

* Pierre preferred a signing method

* Ooops, I need to slow down

* Update bin/node/cli/src/service.rs

* Reexport libp2p crypto used in sc-network

* Added proto3 compatibility tests. And import noise.

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/client/authority-discovery/src/error.rs

@@ -46,10 +46,18 @@ pub enum Error {
 	EncodingDecodingScale(codec::Error),
 	/// Failed to parse a libp2p multi address.
 	ParsingMultiaddress(libp2p::core::multiaddr::Error),
+	/// Failed to parse a libp2p key.
+	ParsingLibp2pIdentity(sc_network::DecodingError),
 	/// Failed to sign using a specific public key.
 	MissingSignature(CryptoTypePublicPair),
 	/// Failed to sign using all public keys.
 	Signing,
 	/// Failed to register Prometheus metric.
 	Prometheus(prometheus_endpoint::PrometheusError),
+	/// Received authority record that contains addresses with multiple peer ids
+	ReceivingDhtValueFoundEventWithDifferentPeerIds,
+	/// Received authority record without any addresses having a peer id
+	ReceivingDhtValueFoundEventWithNoPeerIds,
+	/// Received authority record without a valid signature for the remote peer id.
+	MissingPeerIdSignature,
 }