cumulus: add asset-hub-rococo runtime based on asset-hub-kusama and add asset-bridging support to it (#1215)

This commit adds Rococo Asset Hub dedicated runtime so we can test new
features here, before merging them in Kusama Asset Hub.
Also adds one such feature: asset transfer over bridge (Rococo AssetHub
<> Wococo AssetHub)

- clone `asset-hub-kusama-runtime` -> `asset-hub-rococo-runtime`
- make it use Rococo primitives, names, assets, constants, etc
- add asset-transfer-over-bridge support to Rococo AssetHub <> Wococo
AssetHub

Fixes #1128

---------

Co-authored-by: Branislav Kontur <bkontur@gmail.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>

bridges/modules/xcm-bridge-hub-router/src/benchmarking.rs

@@ -60,6 +60,8 @@ benchmarks_instance_pallet! {
 			is_congested: false,
 			delivery_fee_factor: MINIMAL_DELIVERY_FEE_FACTOR + MINIMAL_DELIVERY_FEE_FACTOR,
 		});
+
+		let _ = T::ensure_bridged_target_destination();
 		T::make_congested();
 	}: {
 		crate::Pallet::<T, I>::on_initialize(Zero::zero())
@@ -79,11 +81,11 @@ benchmarks_instance_pallet! {
 	}
 
 	send_message {
-		// make local queue congested, because it means additional db write
-		T::make_congested();
-
 		let dest = T::ensure_bridged_target_destination();
 		let xcm = sp_std::vec![].into();
+
+		// make local queue congested, because it means additional db write
+		T::make_congested();
 	}: {
 		send_xcm::<crate::Pallet<T, I>>(dest, xcm).expect("message is sent")
 	}