add package.json to exports field

Author: phryneas

package.json

@@ -7,6 +7,7 @@
   "main": "index.js",
   "module": "index.mjs",
   "exports": {
+    "./package.json": "./package.json",
     "./execution/execute.js": {
       "types": {
         "import": "./execution/execute.js.d.mts",