Infrastructure improvements (#2897)

* Factor out runtime module into utils.

* Add maybe_authority information to `PeerConnected` event.

We already gather this information in authority discovery, so we might
as well share it with others.

This opens up an easy path to trigger validators differently from normal
nodes, e.g. for prioritization. This change has become more important
now, that we just connect to all validators and therefore just have a
long peer list without any information about those nodes.

* Test fix.

polkadot/node/network/approval-distribution/src/lib.rs

@@ -191,7 +191,7 @@ impl State {
 		event: NetworkBridgeEvent<protocol_v1::ApprovalDistributionMessage>,
 	) {
 		match event {
-			NetworkBridgeEvent::PeerConnected(peer_id, role) => {
+			NetworkBridgeEvent::PeerConnected(peer_id, role, _) => {
 				// insert a blank view if none already present
 				tracing::trace!(
 					target: LOG_TARGET,

polkadot/node/network/approval-distribution/src/tests.rs

@@ -117,7 +117,7 @@ async fn setup_peer_with_view(
 	overseer_send(
 		virtual_overseer,
 		ApprovalDistributionMessage::NetworkBridgeUpdateV1(
-			NetworkBridgeEvent::PeerConnected(peer_id.clone(), ObservedRole::Full)
+			NetworkBridgeEvent::PeerConnected(peer_id.clone(), ObservedRole::Full, None)
 		)
 	).await;
 	overseer_send(