Introduce async runtime calling trait for runtime-api subsystem (#5782)

* Implement OverseerRuntimeClient

* blockchainevents

* Update patches

* Finish merging rntime-api subsystem

* First version that is able to produce blocks

* Make OverseerRuntimeClient async

* Move overseer notification stream forwarding to cumulus

* Remove unused imports

* Add more logging to collator-protocol

* Lockfile

* Use hashes in OverseerRuntimeClient

* Move OverseerRuntimeClient into extra module

* Fix old session info call and make HeadSupportsParachain async

* Improve naming of trait

* Cleanup

* Remove unused From trait implementation

* Remove unwanted debug print

* Move trait to polkadot-node-subsystem-types

* Add sections to runtime client

Co-authored-by: Davide Galassi <davxy@datawok.net>

* Reorder methods

* Fix spelling

* Fix spacing in Cargo.toml

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Remove unused babe methods

Co-authored-by: Davide Galassi <davxy@datawok.net>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

polkadot/node/subsystem-test-helpers/src/lib.rs

@@ -401,8 +401,10 @@ mod tests {
 	use sp_core::traits::SpawnNamed;
 
 	struct AlwaysSupportsParachains;
+
+	#[async_trait::async_trait]
 	impl HeadSupportsParachains for AlwaysSupportsParachains {
-		fn head_supports_parachains(&self, _head: &Hash) -> bool {
+		async fn head_supports_parachains(&self, _head: &Hash) -> bool {
 			true
 		}
 	}