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/transactions/src/lib.rs

@@ -27,22 +27,29 @@
 //! `Future` that processes transactions.
 
 use crate::config::*;
+
 use codec::{Decode, Encode};
 use futures::{prelude::*, stream::FuturesUnordered};
 use libp2p::{multiaddr, PeerId};
 use log::{debug, trace, warn};
+
 use prometheus_endpoint::{register, Counter, PrometheusError, Registry, U64};
-use sc_network_common::{
+use sc_network::{
 	config::{NonDefaultSetConfig, NonReservedPeerMode, ProtocolId, SetConfig},
 	error,
-	protocol::{event::Event, role::ObservedRole, ProtocolName},
-	service::{NetworkEventStream, NetworkNotification, NetworkPeers},
-	sync::{SyncEvent, SyncEventStream},
+	event::Event,
+	types::ProtocolName,
 	utils::{interval, LruHashSet},
+	NetworkEventStream, NetworkNotification, NetworkPeers,
+};
+use sc_network_common::{
+	role::ObservedRole,
+	sync::{SyncEvent, SyncEventStream},
 	ExHashT,
 };
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver, TracingUnboundedSender};
 use sp_runtime::traits::Block as BlockT;
+
 use std::{
 	collections::{hash_map::Entry, HashMap},
 	iter,