Adds start and stop work heartbeats. (#1188)

* Adds start and stop work heartbeats.

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <[email protected]>

* Fix code after suggested changes

* Finalizing stops work on earlier lower blocks.

* Fix func parameter and flaky test

Co-authored-by: Bastian Köcher <[email protected]>

Author: montekki

Cargo.lock

@@ -9,6 +9,7 @@ futures = "0.3.5"
 log = "0.4.8"
 futures-timer = "3.0.2"
 streamunordered = "0.5.1"
+polkadot-primitives = { path = "../primitives" }
 
 [dev-dependencies]
 futures = { version = "0.3.5", features = ["thread-pool"] }

overseer/Cargo.toml

@@ -111,6 +111,7 @@ fn main() {
 		});
 
 		let (overseer, _handler) = Overseer::new(
+			vec![],
 			Box::new(Subsystem2),
 			Box::new(Subsystem1),
 			spawner,