cmd/jsutils: add a tool for validator version

cmd/jsutils/README.md

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+## Requirement
+
+- nodejs: v20.10.0
+- npm: v10.2.3
+
+## Prepare
+Recommend use [nvm](https://github.com/nvm-sh/nvm) to manage node version.
+
+Install node.js dependency:
+```shell script
+    npm install
+```
+## Run
+```bash
+    npm run start
+```

cmd/jsutils/getvalidatorversion.js

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+import { ethers } from "ethers";
+const testNet = "https://bsc-prebsc-dataseed.bnbchain.org"
+const mainNet = "https://bsc-dataseed.bnbchain.org"
+const provider = new ethers.JsonRpcProvider(mainNet);
+const valNum = 21;
+
+const main = async () => {
+    const blockNum = await provider.getBlockNumber();
+    console.log(blockNum);
+    for (let i = 0; i < valNum; i++) {
+        let blockData = await provider.getBlock(blockNum - i);
+        console.log(blockData.miner);
+        let major = ethers.toNumber(ethers.dataSlice(blockData.extraData, 2, 3))
+        let minor = ethers.toNumber(ethers.dataSlice(blockData.extraData, 3, 4))
+        let patch = ethers.toNumber(ethers.dataSlice(blockData.extraData, 4, 5))
+        console.log("version = ", major, ".", minor, ".", patch)
+    }
+};
+main();

cmd/jsutils/package.json

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+{
+  "name": "jsutils",
+  "version": "1.0.0",
+  "type": "module",
+  "description": "jsUtils for bsc",
+  "main": "index.js",
+  "scripts": {
+    "start": "node getvalidatorversion.js"
+  },
+  "dependencies": {
+    "ethers": "^6.2.3"
+  },
+  "author": "BNB Chain"
+}