feat: export lib files

This exposes the lib files, so `domToReact` can be imported without importing all of `domhandler`,
which reduces bundle size.

It also exposes `attributesToProps`, which is useful (at least in my project)

You can import like `import domToReact from 'html-react-parser/lib/dom-to-react'`

Author: hansottowirtz

Diff for: package.json

@@ -11,6 +11,10 @@
       "import": "./index.mjs",
       "require": "./index.js"
     },
+    "./lib/*": {
+      "types": "./lib/*.d.ts",
+      "default": "./lib/*.js"
+    },
     "./package.json": "./package.json"
   },
   "scripts": {