chore: Add ZKSync and Hardhat contracts package to monorepo

packages/contracts/.env.example

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+PRIVATE_KEY=""

packages/contracts/.gitignore

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+cache-zk/
+artifacts-zk/
+typechain-types/
+deployments-zk/

packages/contracts/deploy/heypro.ts

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+import { Deployer } from "@matterlabs/hardhat-zksync";
+import type { HardhatRuntimeEnvironment } from "hardhat/types";
+import { Wallet } from "zksync-ethers";
+
+export default async function (hre: HardhatRuntimeEnvironment) {
+  try {
+    // Initialize the wallet.
+    const wallet = new Wallet(process.env.PRIVATE_KEY as string);
+    const deployer = new Deployer(hre, wallet as any);
+    const artifact = await deployer.loadArtifact("HeyPro");
+    const heyProContract = await deployer.deploy(artifact);
+    console.log(
+      `${artifact.contractName} was deployed to ${await heyProContract.getAddress()}`
+    );
+  } catch (error) {
+    console.error("Error in deployment:", error);
+    process.exit(1);
+  }
+}

packages/contracts/hardhat.config.ts

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+require("dotenv").config();
+import "@matterlabs/hardhat-zksync";
+import "@nomicfoundation/hardhat-toolbox";
+import type { HardhatUserConfig } from "hardhat/config";
+
+const config: HardhatUserConfig = {
+  solidity: "0.8.28",
+  zksolc: { version: "latest", settings: {} },
+  defaultNetwork: "lensSepoliaTestnet",
+  networks: {
+    lensSepoliaTestnet: {
+      accounts: [process.env.PRIVATE_KEY as string],
+      url: "https://rpc.testnet.lens.dev",
+      chainId: 37111,
+      zksync: true,
+      ethNetwork: "sepolia",
+      verifyURL:
+        "https://api-explorer-verify.staging.lens.zksync.dev/contract_verification"
+    },
+    hardhat: { zksync: true }
+  }
+};
+
+export default config;

packages/contracts/package.json

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+{
+  "name": "@hey/contracts",
+  "version": "0.0.0",
+  "private": true,
+  "license": "AGPL-3.0",
+  "scripts": {
+    "compile": "hardhat compile",
+    "typecheck": "tsc --pretty"
+  },
+  "devDependencies": {
+    "@hey/config": "workspace:*",
+    "@matterlabs/hardhat-zksync": "^1.4.0",
+    "@matterlabs/zksync-contracts": "1.0.0-beta.4",
+    "@nomicfoundation/hardhat-toolbox": "^5.0.0",
+    "@nomiclabs/hardhat-ethers": "^2.2.3",
+    "@openzeppelin/contracts": "^5.1.0",
+    "dotenv": "^16.4.7",
+    "hardhat": "^2.22.15",
+    "typescript": "^5.6.3",
+    "zksync-ethers": "^6.16.1"
+  }
+}

packages/contracts/tsconfig.json

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+{
+  "extends": "@hey/config/base.tsconfig.json",
+  "compilerOptions": {
+    "module": "CommonJS"
+  },
+  "exclude": ["typechain-types"]
+}