feat: add email domains (#1895)

Implemented Email Domains which allows Platform/Enterprise customers to
send emails to recipients using their custom emails.

packages/trpc/server/enterprise-router/get-plans.ts

@@ -0,0 +1,31 @@
+import { getInternalClaimPlans } from '@documenso/ee/server-only/stripe/get-internal-claim-plans';
+import { IS_BILLING_ENABLED } from '@documenso/lib/constants/app';
+import { prisma } from '@documenso/prisma';
+
+import { authenticatedProcedure } from '../trpc';
+
+export const getPlansRoute = authenticatedProcedure.query(async ({ ctx }) => {
+  const userId = ctx.user.id;
+
+  const plans = await getInternalClaimPlans();
+
+  let canCreateFreeOrganisation = false;
+
+  if (IS_BILLING_ENABLED()) {
+    const numberOfFreeOrganisations = await prisma.organisation.count({
+      where: {
+        ownerUserId: userId,
+        subscription: {
+          is: null,
+        },
+      },
+    });
+
+    canCreateFreeOrganisation = numberOfFreeOrganisations === 0;
+  }
+
+  return {
+    plans,
+    canCreateFreeOrganisation,
+  };
+});