chore: add chopsticks config

.chopsticks/README.md

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+# Chopsticks
+
+A brief guide on testing a runtime upgrade with [Chopsticks](https://github.com/AcalaNetwork/chopsticks/).
+
+## Runtime Upgrade
+
+1. Launch local network with forks of Pop and Paseo state:
+    ```shell
+    npx @acala-network/chopsticks@latest xcm -r ./.chopsticks/paseo.yml -p ./.chopsticks/testnet.yml
+    ```
+2. Authorise and apply the authorised runtime upgrade on the local Pop fork.
+3. Build a block on the local relay chain to build a block (using [websocat](https://github.com/vi/websocat)).
+     ```shell
+     websocat ws://localhost:8001
+     {"jsonrpc":"2.0","id":2,"method":"dev_newBlock","params":[{"count":1}]}
+     ```
+4. Build blocks on Pop to complete the upgrade:
+    ```shell
+    websocat ws://localhost:8000
+    {"jsonrpc":"2.0","id":2,"method":"dev_newBlock","params":[{"count":10}]}
+    ```
+5. Verify that the runtime upgrade completed successfully.

.chopsticks/devnet.yml

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+endpoint: wss://rpc2.paseo.popnetwork.xyz
+mock-signature-host: true
+db: ./db.sqlite
+wasm-override: ../pop-node/target/release/wbuild/pop-runtime-devnet/pop_runtime_devnet.wasm
+
+import-storage:
+  System:
+    Account:
+      - - - 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+        - providers: 1
+          data:
+            free: 1000000000000000
+  Sudo:
+    Key: 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY # Alice

.chopsticks/paseo.yml

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+endpoint: wss://rpc.ibp.network/paseo
+mock-signature-host: true
+db: ./db.sqlite
+
+import-storage:
+  System:
+    Account:
+      - - - 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+        - providers: 1
+          data:
+            free: 1000000000000000
+  Sudo:
+    Key: 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY # Alice

.chopsticks/testnet.yml

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+endpoint: wss://rpc2.paseo.popnetwork.xyz
+mock-signature-host: true
+db: ./db.sqlite
+
+import-storage:
+  System:
+    Account:
+      - - - 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+        - providers: 1
+          data:
+            free: 1000000000000000
+  Sudo:
+    Key: 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY # Alice