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/overseer/src/tests.rs

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
+use async_trait::async_trait;
 use futures::{executor, pending, pin_mut, poll, select, stream, FutureExt};
 use std::{collections::HashMap, sync::atomic, task::Poll};
 
@@ -154,8 +155,9 @@ where
 
 struct MockSupportsParachains;
 
+#[async_trait]
 impl HeadSupportsParachains for MockSupportsParachains {
-	fn head_supports_parachains(&self, _head: &Hash) -> bool {
+	async fn head_supports_parachains(&self, _head: &Hash) -> bool {
 		true
 	}
 }