Enable Hardhat contract sizer and gas reporter plugins (#72)

This PR enables two plugins for Hardhat:
- [Hardhat Gas
Reporter](https://github.com/cgewecke/hardhat-gas-reporter)
- [Hardhat Contract
Sizer](https://github.com/ItsNickBarry/hardhat-contract-sizer)

To get cost estimates in USD, it is required to define
`COINMARKETCAP_API_KEY` environment variable with a token generated by
[CoinMarketCap](https://coinmarketcap.com/).

.gitignore

@@ -10,3 +10,6 @@ pnpm-debug.log*
 
 # Temporary directory
 tmp/
+
+# Environment configuration files
+.envrc

core/hardhat.config.ts

@@ -1,6 +1,7 @@
 import type { HardhatUserConfig } from "hardhat/config"
 
 import "@nomicfoundation/hardhat-toolbox"
+import "hardhat-contract-sizer"
 import "hardhat-deploy"
 
 const config: HardhatUserConfig = {
@@ -71,6 +72,17 @@ const config: HardhatUserConfig = {
     },
   },
 
+  contractSizer: {
+    alphaSort: true,
+    runOnCompile: true,
+    strict: true,
+  },
+
+  gasReporter: {
+    enabled: true,
+    coinmarketcap: process.env.COINMARKETCAP_API_KEY,
+  },
+
   typechain: {
     outDir: "typechain",
   },

core/package.json

@@ -45,6 +45,7 @@
     "eslint": "^8.54.0",
     "ethers": "^6.8.1",
     "hardhat": "^2.19.1",
+    "hardhat-contract-sizer": "^2.10.0",
     "hardhat-deploy": "^0.11.43",
     "hardhat-gas-reporter": "^1.0.9",
     "prettier": "^3.1.0",