Refactor CORS configuration and add utility, update package.json for dev start command, and create GraphQL query/mutation files

src/common/utils/cors.utils.ts

@@ -0,0 +1,6 @@
+export const cors = {
+  origin: process.env.CORS_ORIGIN,
+  methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'],
+  allowedHeaders: ['Content-Type', 'Authorization'],
+  credentials: true,
+};