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>

cumulus/pallets/xcmp-queue/Cargo.toml

@@ -28,6 +28,9 @@ cumulus-primitives-core = { path = "../../primitives/core", default-features = f
 # Optional import for benchmarking
 frame-benchmarking = { path = "../../../substrate/frame/benchmarking", default-features = false, optional = true}
 
+# Bridges
+bp-xcm-bridge-hub-router = { path = "../../../bridges/primitives/xcm-bridge-hub-router", default-features = false, optional = true }
+
 [dev-dependencies]
 
 # Substrate
@@ -43,6 +46,7 @@ cumulus-pallet-parachain-system = { path = "../parachain-system", features = ["p
 [features]
 default = [ "std" ]
 std = [
+	"bp-xcm-bridge-hub-router?/std",
 	"codec/std",
 	"cumulus-primitives-core/std",
 	"frame-benchmarking?/std",
@@ -77,3 +81,4 @@ try-runtime = [
 	"polkadot-runtime-common/try-runtime",
 	"sp-runtime/try-runtime",
 ]
+bridging = [ "bp-xcm-bridge-hub-router" ]