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/prisma/schema.prisma

@@ -37,6 +37,9 @@ model User {
   Document             Document[]
   Subscription         Subscription[]
   PasswordResetToken   PasswordResetToken[]
+  ownedTeams           Team[]
+  ownedPendingTeams    TeamPending[]
+  teamMembers          TeamMember[]
   twoFactorSecret      String?
   twoFactorEnabled     Boolean              @default(false)
   twoFactorBackupCodes String?
@@ -103,12 +106,14 @@ model Subscription {
   planId            String             @unique
   priceId           String
   periodEnd         DateTime?
-  userId            Int
+  userId            Int?
+  teamId            Int?               @unique
   createdAt         DateTime           @default(now())
   updatedAt         DateTime           @updatedAt
   cancelAtPeriodEnd Boolean            @default(false)
 
-  User User @relation(fields: [userId], references: [id], onDelete: Cascade)
+  team Team? @relation(fields: [teamId], references: [id], onDelete: Cascade)
+  User User? @relation(fields: [userId], references: [id], onDelete: Cascade)
 
   @@index([userId])
 }
@@ -162,6 +167,8 @@ model Document {
   updatedAt      DateTime            @default(now()) @updatedAt
   completedAt    DateTime?
   deletedAt      DateTime?
+  teamId         Int?
+  team           Team?               @relation(fields: [teamId], references: [id])
 
   @@unique([documentDataId])
   @@index([userId])
@@ -300,6 +307,104 @@ model DocumentShareLink {
   @@unique([documentId, email])
 }
 
+enum TeamMemberRole {
+  ADMIN
+  MANAGER
+  MEMBER
+}
+
+enum TeamMemberInviteStatus {
+  ACCEPTED
+  PENDING
+}
+
+model Team {
+  id                   Int                       @id @default(autoincrement())
+  name                 String
+  url                  String                    @unique
+  createdAt            DateTime                  @default(now())
+  customerId           String?                   @unique
+  ownerUserId          Int
+  members              TeamMember[]
+  invites              TeamMemberInvite[]
+  teamEmail            TeamEmail?
+  emailVerification    TeamEmailVerification?
+  transferVerification TeamTransferVerification?
+
+  owner        User          @relation(fields: [ownerUserId], references: [id])
+  subscription Subscription?
+
+  document Document[]
+}
+
+model TeamPending {
+  id          Int      @id @default(autoincrement())
+  name        String
+  url         String   @unique
+  createdAt   DateTime @default(now())
+  customerId  String   @unique
+  ownerUserId Int
+
+  owner User @relation(fields: [ownerUserId], references: [id], onDelete: Cascade)
+}
+
+model TeamMember {
+  id        Int            @id @default(autoincrement())
+  teamId    Int
+  createdAt DateTime       @default(now())
+  role      TeamMemberRole
+  userId    Int
+  user      User           @relation(fields: [userId], references: [id])
+  team      Team           @relation(fields: [teamId], references: [id], onDelete: Cascade)
+
+  @@unique([userId, teamId])
+}
+
+model TeamEmail {
+  teamId    Int      @id @unique
+  createdAt DateTime @default(now())
+  name      String
+  email     String   @unique
+  team      Team     @relation(fields: [teamId], references: [id], onDelete: Cascade)
+}
+
+model TeamEmailVerification {
+  teamId    Int      @id @unique
+  name      String
+  email     String
+  token     String   @unique
+  expiresAt DateTime
+  createdAt DateTime @default(now())
+
+  team Team @relation(fields: [teamId], references: [id], onDelete: Cascade)
+}
+
+model TeamTransferVerification {
+  teamId              Int      @id @unique
+  userId              Int
+  name                String
+  email               String
+  token               String   @unique
+  expiresAt           DateTime
+  createdAt           DateTime @default(now())
+  clearPaymentMethods Boolean  @default(false)
+
+  team Team @relation(fields: [teamId], references: [id], onDelete: Cascade)
+}
+
+model TeamMemberInvite {
+  id        Int                    @id @default(autoincrement())
+  teamId    Int
+  createdAt DateTime               @default(now())
+  email     String
+  status    TeamMemberInviteStatus @default(PENDING)
+  role      TeamMemberRole
+  token     String                 @unique
+  team      Team                   @relation(fields: [teamId], references: [id], onDelete: Cascade)
+
+  @@unique([teamId, email])
+}
+
 enum TemplateType {
   PUBLIC
   PRIVATE