Move code from sc-network-common back to sc-network (#13592)

* Move service tests to `client/network/tests`

These tests depend on `sc-network` and `sc-network-sync` so they should
live outside the crate.

* Move some configs from `sc-network-common` to `sc-network`

* Move `NetworkService` traits to `sc-network`

* Move request-responses to `sc-network`

* Remove more stuff

* Remove rest of configs from `sc-network-common` to `sc-network`

* Remove more stuff

* Fix warnings

* Update client/network/src/request_responses.rs

Co-authored-by: Dmitry Markin <dmitry@markin.tech>

* Fix cargo doc

---------

Co-authored-by: Dmitry Markin <dmitry@markin.tech>

substrate/client/network-gossip/src/bridge.rs

@@ -21,10 +21,8 @@ use crate::{
 	Network, Syncing, Validator,
 };
 
-use sc_network_common::{
-	protocol::{event::Event, ProtocolName},
-	sync::SyncEvent,
-};
+use sc_network::{event::Event, types::ProtocolName};
+use sc_network_common::sync::SyncEvent;
 use sc_peerset::ReputationChange;
 
 use futures::{
@@ -340,15 +338,11 @@ mod tests {
 		future::poll_fn,
 	};
 	use quickcheck::{Arbitrary, Gen, QuickCheck};
-	use sc_network_common::{
-		config::MultiaddrWithPeerId,
-		protocol::role::ObservedRole,
-		service::{
-			NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers,
-			NotificationSender, NotificationSenderError,
-		},
-		sync::SyncEventStream,
+	use sc_network::{
+		config::MultiaddrWithPeerId, NetworkBlock, NetworkEventStream, NetworkNotification,
+		NetworkPeers, NotificationSenderError, NotificationSenderT as NotificationSender,
 	};
+	use sc_network_common::{role::ObservedRole, sync::SyncEventStream};
 	use sp_runtime::{
 		testing::H256,
 		traits::{Block as BlockT, NumberFor},