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>

Cargo.toml

@@ -16,6 +16,8 @@ members = [
 	"bridges/modules/xcm-bridge-hub-router",
 	"bridges/primitives/chain-asset-hub-kusama",
 	"bridges/primitives/chain-asset-hub-polkadot",
+	"bridges/primitives/chain-asset-hub-rococo",
+	"bridges/primitives/chain-asset-hub-wococo",
 	"bridges/primitives/chain-bridge-hub-cumulus",
 	"bridges/primitives/chain-bridge-hub-kusama",
 	"bridges/primitives/chain-bridge-hub-polkadot",
@@ -69,6 +71,7 @@ members = [
 	"cumulus/parachains/pallets/ping",
 	"cumulus/parachains/runtimes/assets/asset-hub-kusama",
 	"cumulus/parachains/runtimes/assets/asset-hub-polkadot",
+	"cumulus/parachains/runtimes/assets/asset-hub-rococo",
 	"cumulus/parachains/runtimes/assets/asset-hub-westend",
 	"cumulus/parachains/runtimes/assets/common",
 	"cumulus/parachains/runtimes/assets/test-utils",