Network sync refactoring (part 2) (#11322)

* Move `api.v1.proto` schema into new crate `sc-network-sync`

* Move `sc_network::protocol::sync::state` module into `sc_network_sync::state`

* Move `sc_network::protocol::sync::blocks` module into `sc_network_sync::blocks` and some data structures from `sc_network::protocol::message` module into `sc_network_sync::message`

* Move some data structures from `sc_network::config` and `sc_network::request_responses` into new `sc-network-common` crate

* Move `sc_network::protocol::sync::warm` and `sc_network::warp_request_handler` modules into `sc_network_sync`

* Move `client/network/sync/src/lib.rs` to `client/network/sync/src/lib_old.rs` to preserve history of changes of the file in the next commit

* Move `client/network/src/protocol/sync.rs` on top of `client/network/sync/src/lib.rs` to preserve history of changes

* Move `sc_network::protocol::sync` to `sc_network_sync` with submodules, move message data structures around accordingly

* Move `sc_network::block_request_handler` to `sc_network_sync::block_request_handler`

* Move `sc_network::state_request_handler` to `sc_network_sync::state_request_handler`

* Add re-exports for compatibility reasons

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/Cargo.lock

@@ -8971,6 +8971,8 @@ dependencies = [
  "sc-block-builder",
  "sc-client-api",
  "sc-consensus",
+ "sc-network-common",
+ "sc-network-sync",
  "sc-peerset",
  "sc-utils",
  "serde",
@@ -8994,6 +8996,18 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "sc-network-common"
+version = "0.10.0-dev"
+dependencies = [
+ "futures 0.3.21",
+ "libp2p",
+ "parity-scale-codec",
+ "prost-build",
+ "sc-peerset",
+ "smallvec 1.8.0",
+]
+
 [[package]]
 name = "sc-network-gossip"
 version = "0.10.0-dev"
@@ -9013,6 +9027,39 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "sc-network-sync"
+version = "0.10.0-dev"
+dependencies = [
+ "bitflags",
+ "either",
+ "fork-tree",
+ "futures 0.3.21",
+ "libp2p",
+ "log 0.4.16",
+ "lru",
+ "parity-scale-codec",
+ "prost",
+ "prost-build",
+ "quickcheck",
+ "sc-block-builder",
+ "sc-client-api",
+ "sc-consensus",
+ "sc-network-common",
+ "sc-peerset",
+ "smallvec 1.8.0",
+ "sp-arithmetic",
+ "sp-blockchain",
+ "sp-consensus",
+ "sp-core",
+ "sp-finality-grandpa",
+ "sp-runtime",
+ "sp-test-primitives",
+ "sp-tracing",
+ "substrate-test-runtime-client",
+ "thiserror",
+]
+
 [[package]]
 name = "sc-network-test"
 version = "0.8.0"
@@ -9029,6 +9076,7 @@ dependencies = [
  "sc-client-api",
  "sc-consensus",
  "sc-network",
+ "sc-network-common",
  "sc-service",
  "sp-blockchain",
  "sp-consensus",
@@ -9217,6 +9265,7 @@ dependencies = [
  "sc-informant",
  "sc-keystore",
  "sc-network",
+ "sc-network-common",
  "sc-offchain",
  "sc-rpc",
  "sc-rpc-server",