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/network/src/lib.rs

@@ -273,8 +273,9 @@ pub use protocol::{
 	PeerInfo,
 };
 pub use service::{
-	IfDisconnected, NetworkService, NetworkWorker, NotificationSender, NotificationSenderReady,
-	OutboundFailure, RequestFailure,
+	DecodingError, IfDisconnected, KademliaKey, Keypair, NetworkService, NetworkWorker,
+	NotificationSender, NotificationSenderReady, OutboundFailure, PublicKey, RequestFailure,
+	Signature, SigningError,
 };
 
 pub use sc_peerset::ReputationChange;