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/get-team-members.ts

@@ -0,0 +1,33 @@
+import { prisma } from '@documenso/prisma';
+
+export type GetTeamMembersOptions = {
+  userId: number;
+  teamId: number;
+};
+
+/**
+ * Get all team members for a given team.
+ */
+export const getTeamMembers = async ({ userId, teamId }: GetTeamMembersOptions) => {
+  return await prisma.teamMember.findMany({
+    where: {
+      team: {
+        id: teamId,
+        members: {
+          some: {
+            userId: userId,
+          },
+        },
+      },
+    },
+    include: {
+      user: {
+        select: {
+          id: true,
+          email: true,
+          name: true,
+        },
+      },
+    },
+  });
+};