Network sync refactoring (part 7) (#12006)

* Move `MultiaddrWithPeerId` and related parsing functions into `sc-network-common`, remove dependency on `sc-network` from `sc-chain-spec`

* Remove dependency on `sc-network` from `sc-offchain`

* Remove dependency on `sc-network` from `sc-network-gossip`

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

@@ -16,7 +16,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use sc_network::PeerId;
+use libp2p::PeerId;
 use sc_network_common::protocol::event::ObservedRole;
 use sp_runtime::traits::Block as BlockT;