[testnet] Add AssetHubRococo <-> AssetHubWestend asset bridging support (#1967)

## Summary

Asset bridging support for AssetHub**Rococo** <-> AssetHub**Wococo** was
added [here](https://github.com/paritytech/polkadot-sdk/pull/1215), so
now we aim to bridge AssetHub**Rococo** and AssetHub**Westend**. (And
perhaps retire AssetHubWococo and the Wococo chains).

## Solution

**bridge-hub-westend-runtime**
- added new runtime as a copy of `bridge-hub-rococo-runtime`
- added support for bridging to `BridgeHubRococo`
- added tests and benchmarks

**bridge-hub-rococo-runtime**
- added support for bridging to `BridgeHubWestend`
- added tests and benchmarks
- internal refactoring by splitting bridge configuration per network,
e.g., `bridge_to_whatevernetwork_config.rs`.

**asset-hub-rococo-runtime**
- added support for asset bridging to `AssetHubWestend` (allows to
receive only WNDs)
- added new xcm router for `Westend`
- added tests and benchmarks

**asset-hub-westend-runtime**
- added support for asset bridging to `AssetHubRococo` (allows to
receive only ROCs)
- added new xcm router for `Rococo`
- added tests and benchmarks

## Deployment

All changes will be deployed as a part of
https://github.com/paritytech/polkadot-sdk/issues/1988.

## TODO

- [x] benchmarks for all pallet instances
- [x] integration tests
- [x] local run scripts


Relates to:
https://github.com/paritytech/parity-bridges-common/issues/2602
Relates to: https://github.com/paritytech/polkadot-sdk/issues/1988

---------

Co-authored-by: command-bot <>
Co-authored-by: Adrian Catangiu <adrian@parity.io>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

bridges/zombienet/run-tests.sh

@@ -0,0 +1,97 @@
+#!/bin/bash
+#set -eu
+shopt -s nullglob
+
+trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT
+
+# assuming that we'll be using native provide && all processes will be executing locally
+# (we need absolute paths here, because they're used when scripts are called by zombienet from tmp folders)
+export POLKADOT_SDK_FOLDER=`realpath $(dirname "$0")/../..`
+export BRIDGE_TESTS_FOLDER=$POLKADOT_SDK_FOLDER/bridges/zombienet/tests
+export POLKADOT_BINARY_PATH=$POLKADOT_SDK_FOLDER/target/release/polkadot
+export POLKADOT_PARACHAIN_BINARY_PATH=$POLKADOT_SDK_FOLDER/target/release/polkadot-parachain
+export POLKADOT_PARACHAIN_BINARY_PATH_FOR_ASSET_HUB_ROCOCO=$POLKADOT_PARACHAIN_BINARY_PATH
+export POLKADOT_PARACHAIN_BINARY_PATH_FOR_ASSET_HUB_WOCOCO=$POLKADOT_PARACHAIN_BINARY_PATH
+export ZOMBIENET_BINARY_PATH=~/local_bridge_testing/bin/zombienet-linux
+
+# bridge configuration
+export LANE_ID="00000001"
+
+# tests configuration
+ALL_TESTS_FOLDER=`mktemp -d`
+
+function start_coproc() {
+    local command=$1
+    local name=$2
+    local coproc_log=`mktemp -p $TEST_FOLDER`
+    coproc COPROC {
+        $command >$coproc_log 2>&1
+    }
+    TEST_COPROCS[$COPROC_PID, 0]=$name
+    TEST_COPROCS[$COPROC_PID, 1]=$coproc_log
+    echo "Spawned $name coprocess. StdOut + StdErr: $coproc_log"
+
+    return $COPROC_PID
+}
+
+# execute every test from tests folder
+TEST_INDEX=1
+while true
+do
+    declare -A TEST_COPROCS
+    TEST_COPROCS_COUNT=0
+    TEST_PREFIX=$(printf "%04d" $TEST_INDEX)
+
+    # it'll be used by the `sync-exit.sh` script
+    export TEST_FOLDER=`mktemp -d -p $ALL_TESTS_FOLDER`
+
+    # check if there are no more tests
+    zndsl_files=($BRIDGE_TESTS_FOLDER/$TEST_PREFIX-*.zndsl)
+    if [ ${#zndsl_files[@]} -eq 0 ]; then
+        break
+    fi
+
+    # start relay
+    if [ -f $BRIDGE_TESTS_FOLDER/$TEST_PREFIX-start-relay.sh ]; then
+        start_coproc "${BRIDGE_TESTS_FOLDER}/${TEST_PREFIX}-start-relay.sh" "relay"
+        RELAY_COPROC=$COPROC_PID
+        ((TEST_COPROCS_COUNT++))
+    fi
+    # start tests
+    for zndsl_file in "${zndsl_files[@]}"; do
+        start_coproc "$ZOMBIENET_BINARY_PATH --provider native test $zndsl_file" "$zndsl_file"
+        echo -n "1">>$TEST_FOLDER/exit-sync
+        ((TEST_COPROCS_COUNT++))
+    done
+    # wait until all tests are completed
+    relay_exited=0
+    for n in `seq 1 $TEST_COPROCS_COUNT`; do
+        wait -n -p COPROC_PID
+        exit_code=$?
+        coproc_name=${TEST_COPROCS[$COPROC_PID, 0]}
+        coproc_log=${TEST_COPROCS[$COPROC_PID, 1]}
+        coproc_stdout=$(cat $coproc_log)
+        relay_exited=$(expr "${coproc_name}" == "relay")
+        echo "Process $coproc_name has finished with exit code: $exit_code"
+
+        # if exit code is not zero, exit
+        if [ $exit_code -ne 0 ]; then
+            echo "====================================================================="
+            echo "=== Shutting down. Log of failed process below                    ==="
+            echo "====================================================================="
+            echo $coproc_stdout
+            exit 1
+        fi
+
+        # if last test has exited, exit relay too
+        if [ $n -eq $(($TEST_COPROCS_COUNT - 1)) ] && [ $relay_exited -eq 0 ]; then
+            kill $RELAY_COPROC
+            break
+        fi
+    done
+    ((TEST_INDEX++))
+done
+
+echo "====================================================================="
+echo "=== All tests have completed successfully                         ==="
+echo "====================================================================="