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/src/behaviour.rs

@@ -18,9 +18,11 @@
 
 use crate::{
 	discovery::{DiscoveryBehaviour, DiscoveryConfig, DiscoveryOut},
+	event::DhtEvent,
 	peer_info,
 	protocol::{CustomMessageOutcome, NotificationsSink, Protocol},
-	request_responses,
+	request_responses::{self, IfDisconnected, ProtocolConfig, RequestFailure},
+	types::ProtocolName,
 };
 
 use bytes::Bytes;
@@ -32,14 +34,7 @@ use libp2p::{
 	swarm::NetworkBehaviour,
 };
 
-use sc_network_common::{
-	protocol::{
-		event::DhtEvent,
-		role::{ObservedRole, Roles},
-		ProtocolName,
-	},
-	request_responses::{IfDisconnected, ProtocolConfig, RequestFailure},
-};
+use sc_network_common::role::{ObservedRole, Roles};
 use sc_peerset::{PeersetHandle, ReputationChange};
 use sp_runtime::traits::Block as BlockT;
 use std::{collections::HashSet, time::Duration};