Add Wococo<>Rococo Header Relayer (#925)

* Add Wococo primitives crate

* Add more Wococo boilerplate code

* Add CLI support for initializing the Wococo<>Rococo bridge

* Add support for relaying headers between Rococo and Wococo

* Fix test

* RustFmt

* Fix compilation issues related to enum naming

* Bump Rococo `spec_version`

* Remove stray Westend references

bridges/relays/bin-substrate/src/cli/init_bridge.rs

@@ -44,6 +44,8 @@ arg_enum! {
 		MillauToRialto,
 		RialtoToMillau,
 		WestendToMillau,
+		RococoToWococo,
+		WococoToRococo,
 	}
 }
 
@@ -98,6 +100,30 @@ macro_rules! select_bridge {
 					.into()
 				}
 
+				$generic
+			}
+			InitBridgeName::RococoToWococo => {
+				type Source = relay_rococo_client::Rococo;
+				type Target = relay_wococo_client::Wococo;
+
+				fn encode_init_bridge(
+					init_data: InitializationData<<Source as ChainBase>::Header>,
+				) -> <Target as Chain>::Call {
+					bp_wococo::Call::BridgeGrandpaRococo(bp_wococo::BridgeGrandpaRococoCall::initialize(init_data))
+				}
+
+				$generic
+			}
+			InitBridgeName::WococoToRococo => {
+				type Source = relay_wococo_client::Wococo;
+				type Target = relay_rococo_client::Rococo;
+
+				fn encode_init_bridge(
+					init_data: InitializationData<<Source as ChainBase>::Header>,
+				) -> <Target as Chain>::Call {
+					bp_rococo::Call::BridgeGrandpaWococo(bp_rococo::BridgeGrandpaWococoCall::initialize(init_data))
+				}
+
 				$generic
 			}
 		}