chore: add package.json reference in exports for improved module resolution

Author: cklwblove

package.json

@@ -25,7 +25,8 @@
       "types": "./dist/index.d.ts",
       "import": "./dist/index.js",
       "require": "./dist/index.cjs"
-    }
+    },
+    "./package.json": "./package.json"
   },
   "main": "./dist/index.cjs",
   "module": "./dist/index.js",