sc-consensus-beefy: add peer reputation cost/benefit changes (#13881)

* add cost/benefit to gossip messages
* report BEEFY gossip peer reputation changes
* drop WorkerParams helper struct
* add reputation costs to tests
* add peer reputation cost/benefit to on-demand-requests protocol
* include amount of signatures checked in invalid proof reputation cost

Signed-off-by: Adrian Catangiu <adrian@parity.io>

substrate/client/consensus/beefy/src/import.rs

@@ -109,6 +109,7 @@ where
 			.ok_or_else(|| ImportError("Unknown validator set".to_string()))?;
 
 		decode_and_verify_finality_proof::<Block>(&encoded[..], number, &validator_set)
+			.map_err(|(err, _)| err)
 	}
 }