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-teams.ts

@@ -0,0 +1,33 @@
+import { prisma } from '@documenso/prisma';
+
+export type GetTeamsOptions = {
+  userId: number;
+};
+export type GetTeamsResponse = Awaited<ReturnType<typeof getTeams>>;
+
+export const getTeams = async ({ userId }: GetTeamsOptions) => {
+  const teams = await prisma.team.findMany({
+    where: {
+      members: {
+        some: {
+          userId,
+        },
+      },
+    },
+    include: {
+      members: {
+        where: {
+          userId,
+        },
+        select: {
+          role: true,
+        },
+      },
+    },
+  });
+
+  return teams.map(({ members, ...team }) => ({
+    ...team,
+    currentTeamMember: members[0],
+  }));
+};