rpc: bump jsonrpsee v0.22 and fix race in rpc v2 chain_head (#3230)

Close #2992 

Breaking changes:
- rpc server grafana metric `substrate_rpc_requests_started` is removed
(not possible to implement anymore)
- rpc server grafana metric `substrate_rpc_requests_finished` is removed
(not possible to implement anymore)
- rpc server ws ping/pong not ACK:ed within 30 seconds more than three
times then the connection will be closed

Added
- rpc server grafana metric `substrate_rpc_sessions_time` is added to
get the duration for each websocket session

substrate/client/rpc/src/dev/tests.rs

@@ -100,7 +100,7 @@ async fn deny_unsafe_works() {
 	let (resp, _) = api.raw_json_request(&request, 1).await.expect("Raw calls should succeed");
 
 	assert_eq!(
-		resp.result,
+		resp,
 		r#"{"jsonrpc":"2.0","error":{"code":-32601,"message":"RPC call is unsafe to be called externally"},"id":1}"#
 	);
 }