feat: add teams (#848)

## Description

Add support for teams which will allow users to collaborate on
documents.

Teams features allows users to:

- Create, manage and transfer teams
- Manage team members
- Manage team emails
- Manage a shared team inbox and documents

These changes do NOT include the following, which are planned for a
future release:

- Team templates
- Team API
- Search menu integration

## Testing Performed

- Added E2E tests for general team management
- Added E2E tests to validate document counts

## Checklist

- [X] I have tested these changes locally and they work as expected.
- [X] I have added/updated tests that prove the effectiveness of these
changes.
- [ ] I have updated the documentation to reflect these changes, if
applicable.
- [X] I have followed the project's coding style guidelines.

packages/ee/server-only/stripe/get-team-prices.ts

@@ -0,0 +1,43 @@
+import type Stripe from 'stripe';
+
+import { STRIPE_PLAN_TYPE } from '@documenso/lib/constants/billing';
+import { AppError } from '@documenso/lib/errors/app-error';
+
+import { getPricesByPlan } from './get-prices-by-plan';
+
+export const getTeamPrices = async () => {
+  const prices = (await getPricesByPlan(STRIPE_PLAN_TYPE.TEAM)).filter((price) => price.active);
+
+  const monthlyPrice = prices.find((price) => price.recurring?.interval === 'month');
+  const yearlyPrice = prices.find((price) => price.recurring?.interval === 'year');
+  const priceIds = prices.map((price) => price.id);
+
+  if (!monthlyPrice || !yearlyPrice) {
+    throw new AppError('INVALID_CONFIG', 'Missing monthly or yearly price');
+  }
+
+  return {
+    monthly: {
+      friendlyInterval: 'Monthly',
+      interval: 'monthly',
+      ...extractPriceData(monthlyPrice),
+    },
+    yearly: {
+      friendlyInterval: 'Yearly',
+      interval: 'yearly',
+      ...extractPriceData(yearlyPrice),
+    },
+    priceIds,
+  } as const;
+};
+
+const extractPriceData = (price: Stripe.Price) => {
+  const product =
+    typeof price.product !== 'string' && !price.product.deleted ? price.product : null;
+
+  return {
+    priceId: price.id,
+    description: product?.description ?? '',
+    features: product?.features ?? [],
+  };
+};