fix: add CommonJS export to estree-walker package.json to resolve ERR…

[jrTilak]

…_PACKAGE_PATH_NOT_EXPORTED error

fixes #26

The error ERR_PACKAGE_PATH_NOT_EXPORTED occurs because the estree-walker package does not have an appropriate export defined for CommonJS modules in its package.json file. By adding "require": "./src/index.js" to the exports field, you explicitly define the entry point for CommonJS modules, which resolves the issue.

".": {
      "types": "./types/index.d.ts",
      "import": "./src/index.js",
      "require": "./src/index.js" 
    }