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/limits/handler.ts

@@ -1,10 +1,10 @@
-import { NextApiRequest, NextApiResponse } from 'next';
+import type { NextApiRequest, NextApiResponse } from 'next';
 
 import { getToken } from 'next-auth/jwt';
 import { match } from 'ts-pattern';
 
 import { ERROR_CODES } from './errors';
-import { TLimitsErrorResponseSchema, TLimitsResponseSchema } from './schema';
+import type { TLimitsErrorResponseSchema, TLimitsResponseSchema } from './schema';
 import { getServerLimits } from './server';
 
 export const limitsHandler = async (
@@ -14,7 +14,19 @@ export const limitsHandler = async (
   try {
     const token = await getToken({ req });
 
-    const limits = await getServerLimits({ email: token?.email });
+    const rawTeamId = req.headers['team-id'];
+
+    let teamId: number | null = null;
+
+    if (typeof rawTeamId === 'string' && !isNaN(parseInt(rawTeamId, 10))) {
+      teamId = parseInt(rawTeamId, 10);
+    }
+
+    if (!teamId && rawTeamId) {
+      throw new Error(ERROR_CODES.INVALID_TEAM_ID);
+    }
+
+    const limits = await getServerLimits({ email: token?.email, teamId });
 
     return res.status(200).json(limits);
   } catch (err) {