Allow to broadcast network messages in parallel (#1409)

This PR addresses multiple issues pending:

* [x] Update orchestra to the recent version and test how the node
performs
* [x] Add some useful metrics for outbound network bridge
* [x] Try to send incoming network requests to all subsystems without
blocking on some particular subsystem in that loop
* [x] Fix all incompatibilities between orchestra and polkadot code
(e.g. malus node)

polkadot/node/overseer/src/lib.rs

@@ -107,7 +107,7 @@ pub use orchestra::{
 	contextbounds, orchestra, subsystem, FromOrchestra, MapSubsystem, MessagePacket,
 	OrchestraError as OverseerError, SignalsReceived, Spawner, Subsystem, SubsystemContext,
 	SubsystemIncomingMessages, SubsystemInstance, SubsystemMeterReadouts, SubsystemMeters,
-	SubsystemSender, TimeoutExt, ToOrchestra,
+	SubsystemSender, TimeoutExt, ToOrchestra, TrySendError,
 };
 
 /// Store 2 days worth of blocks, not accounting for forks,

polkadot/node/overseer/src/tests.rs

@@ -1074,6 +1074,7 @@ fn overseer_all_subsystems_receive_signals_and_messages() {
 
 #[test]
 fn context_holds_onto_message_until_enough_signals_received() {
+	const CHANNEL_CAPACITY: usize = 64;
 	let (candidate_validation_bounded_tx, _) = metered::channel(CHANNEL_CAPACITY);
 	let (candidate_backing_bounded_tx, _) = metered::channel(CHANNEL_CAPACITY);
 	let (statement_distribution_bounded_tx, _) = metered::channel(CHANNEL_CAPACITY);