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.