New service initial commit (#1234)

* New service initial commit

* More separation of the new and old services

* Fix review comments

* Adds polkadot.json

* Fix browser build

* Remove unused import

* Update node/service/src/lib.rs

Co-authored-by: Fedor Sakharov <fedor.sakharov@gmail.com>

* Remove duplicate json files

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

polkadot/node/overseer/src/lib.rs

@@ -56,6 +56,7 @@
 
 use std::fmt::Debug;
 use std::pin::Pin;
+use std::sync::Arc;
 use std::task::Poll;
 use std::time::Duration;
 use std::collections::HashSet;
@@ -232,7 +233,7 @@ impl OverseerHandler {
 /// [`Overseer`]: struct.Overseer.html
 /// [`OverseerHandler`]: struct.OverseerHandler.html
 pub async fn forward_events<P: BlockchainEvents<Block>>(
-	client: P,
+	client: Arc<P>,
 	mut handler: OverseerHandler,
 ) -> SubsystemResult<()> {
 	let mut finality = client.finality_notification_stream();