fix(medusa-js): Types for bundler (#5400)

* fix(package.json): add types in exports to help with projects using tsconfig moduleResolution: bundler

* chore: add changeset

packages/medusa-js/package.json

@@ -11,7 +11,8 @@
   "exports": {
     ".": {
       "import": "./dist/index.mjs",
-      "require": "./dist/index.js"
+      "require": "./dist/index.js",
+      "types": "./dist/index.d.ts"
     },
     "./package.json": "./package.json"
   },