chore: :label: Adding Types to Medusa Configuration

Added a JSDoc `@type` to the `medusa-config.js` file.

Based on this discussion : https://github.com/medusajs/medusa/discussions/3275

medusa-config.js

@@ -53,7 +53,7 @@ const plugins = [
   //   },
   // },
 ];
-
+/** @type {import('@medusajs/medusa/dist/types/global').ConfigModule} */
 module.exports = {
   projectConfig: {
     // redis_url: REDIS_URL,