Move transactions protocol to its own crate (#12264)

* Move transaction protocol to its own crate

* Update Cargo.lock

* Fix binaries

* Update client/network/transactions/src/lib.rs

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

* Update client/service/src/builder.rs

Co-authored-by: Bastian Köcher <info@kchr.de>

* Apply review comments

* Revert one change and apply cargo-fmt

* Remove Transaction from Message

* Add array-bytes

* trigger CI

* Add comment about codec index

Co-authored-by: Dmitry Markin <dmitry@markin.tech>
Co-authored-by: Bastian Köcher <info@kchr.de>

substrate/client/network/src/peer_info.rs

@@ -16,7 +16,6 @@
 // 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 crate::utils::interval;
 use fnv::FnvHashMap;
 use futures::prelude::*;
 use libp2p::{
@@ -33,6 +32,7 @@ use libp2p::{
 	Multiaddr,
 };
 use log::{debug, error, trace};
+use sc_network_common::utils::interval;
 use smallvec::SmallVec;
 use std::{
 	collections::hash_map::Entry,