feat: add GetPaymentPlans graphQL query

packages/backend/src/graphql/queries/get-payment-plans.ee.ts

@@ -0,0 +1,10 @@
+import appConfig from '../../config/app';
+import Billing from '../../helpers/billing/index.ee';
+
+const getPaymentPlans = async () => {
+  if (!appConfig.isCloud) return;
+
+  return Billing.paddlePlans;
+};
+
+export default getPaymentPlans;