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/lib/server-only/team/create-team-checkout-session.ts

@@ -0,0 +1,52 @@
+import { getCheckoutSession } from '@documenso/ee/server-only/stripe/get-checkout-session';
+import { getTeamPrices } from '@documenso/ee/server-only/stripe/get-team-prices';
+import { WEBAPP_BASE_URL } from '@documenso/lib/constants/app';
+import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
+import { prisma } from '@documenso/prisma';
+
+export type CreateTeamPendingCheckoutSession = {
+  userId: number;
+  pendingTeamId: number;
+  interval: 'monthly' | 'yearly';
+};
+
+export const createTeamPendingCheckoutSession = async ({
+  userId,
+  pendingTeamId,
+  interval,
+}: CreateTeamPendingCheckoutSession) => {
+  const teamPendingCreation = await prisma.teamPending.findFirstOrThrow({
+    where: {
+      id: pendingTeamId,
+      ownerUserId: userId,
+    },
+    include: {
+      owner: true,
+    },
+  });
+
+  const prices = await getTeamPrices();
+  const priceId = prices[interval].priceId;
+
+  try {
+    const stripeCheckoutSession = await getCheckoutSession({
+      customerId: teamPendingCreation.customerId,
+      priceId,
+      returnUrl: `${WEBAPP_BASE_URL}/settings/teams`,
+      subscriptionMetadata: {
+        pendingTeamId: pendingTeamId.toString(),
+      },
+    });
+
+    if (!stripeCheckoutSession) {
+      throw new AppError(AppErrorCode.UNKNOWN_ERROR);
+    }
+
+    return stripeCheckoutSession;
+  } catch (e) {
+    console.error(e);
+
+    // Absorb all the errors incase Stripe throws something sensitive.
+    throw new AppError(AppErrorCode.UNKNOWN_ERROR, 'Something went wrong.');
+  }
+};