feat: delete user from db and unsubscribe from stripe

packages/ee/server-only/stripe/delete-customer.ts

@@ -0,0 +1,10 @@
+import { stripe } from '@documenso/lib/server-only/stripe';
+import type { User } from '@documenso/prisma/client';
+
+export const deleteStripeCustomer = async (user: User) => {
+  if (!user.customerId) {
+    return null;
+  }
+
+  return await stripe.customers.del(user.customerId);
+};