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/core/candidate-validation/src/lib.rs

@@ -592,7 +592,7 @@ impl metrics::Metrics for Metrics {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
+	use super::*;
 	use polkadot_node_subsystem_test_helpers as test_helpers;
 	use polkadot_primitives::v1::{HeadData, UpwardMessage};
 	use sp_core::testing::TaskExecutor;