feat(cart): Add cart module package (#5982)

* feat: Add CartModule foundation

* remove migration

* fix ts issue

* Create hot-dingos-pay.md

packages/medusa-react/src/hooks/admin/custom/mutations.ts

@@ -86,9 +86,7 @@ export const buildCustomOptions = <
         })
       }
 
-      if (options?.onSuccess) {
-        return options.onSuccess(...args)
-      }
+      return options?.onSuccess?.(...args)
     },
   }
 }