[xcm-emulator] Chains generic over Network & Integration tests restructure (#2092)

Closes:
- #1383 
- Declared chains can be now be imported and reused in a different
crate.
- Chain declaration are now generic over a generic type `N` (the
Network)
- #1389
- Solved #1383, chains and networks declarations can be restructure to
avoid having to compile all chains when running integrations tests where
are not needed.
- Chains are now declared on its own crate (removed from
`integration-tests-common`)
- Networks are now declared on its own crate (removed from
`integration-tests-common`)
    - Integration tests will import only the relevant Network crate
- `integration-tests-common` is renamed to
`emulated-integration-tests-common`

All this is necessary to be able to implement what is described here:
https://github.com/paritytech/roadmap/issues/56#issuecomment-1777010553

---------

Co-authored-by: command-bot <>

cumulus/parachains/integration-tests/emulated/networks/rococo-system/src/lib.rs

@@ -0,0 +1,51 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+pub use asset_hub_rococo_emulated_chain;
+pub use bridge_hub_rococo_emulated_chain;
+pub use penpal_emulated_chain;
+pub use rococo_emulated_chain;
+
+use asset_hub_rococo_emulated_chain::AssetHubRococo;
+use bridge_hub_rococo_emulated_chain::BridgeHubRococo;
+use penpal_emulated_chain::{PenpalA, PenpalB};
+use rococo_emulated_chain::Rococo;
+
+// Cumulus
+use emulated_integration_tests_common::{
+	accounts::{ALICE, BOB},
+	xcm_emulator::{decl_test_networks, decl_test_sender_receiver_accounts_parameter_types},
+};
+
+decl_test_networks! {
+	pub struct RococoMockNet {
+		relay_chain = Rococo,
+		parachains = vec![
+			AssetHubRococo,
+			BridgeHubRococo,
+			PenpalA,
+			PenpalB,
+		],
+		bridge = ()
+	},
+}
+
+decl_test_sender_receiver_accounts_parameter_types! {
+	RococoRelay { sender: ALICE, receiver: BOB },
+	AssetHubRococoPara { sender: ALICE, receiver: BOB },
+	BridgeHubRococoPara { sender: ALICE, receiver: BOB },
+	PenpalAPara { sender: ALICE, receiver: BOB },
+	PenpalBPara { sender: ALICE, receiver: BOB }
+}