Invite members (#161)

* Allow user invitations

* Restyle inviting members

* Remove annoying comment

* Add page for accepting an invitation

* Send invitation email with Brevo

* Prevent admins from removing personal project users

* Mark access ceontrol for cancelProjectInvitation

* Make RadioGroup controlled

* Shorten form helper text

* Use nodemailer to send emails

* Update .env.example

app/prisma/schema.prisma

@@ -207,13 +207,14 @@ model Project {
     personalProjectUserId String? @unique @db.Uuid
     personalProjectUser   User?   @relation(fields: [personalProjectUserId], references: [id], onDelete: Cascade)
 
-    createdAt    DateTime      @default(now())
-    updatedAt    DateTime      @updatedAt
-    projectUsers ProjectUser[]
-    experiments  Experiment[]
-    datasets     Dataset[]
-    loggedCalls  LoggedCall[]
-    apiKeys      ApiKey[]
+    createdAt               DateTime      @default(now())
+    updatedAt               DateTime      @updatedAt
+    projectUsers            ProjectUser[]
+    projectUserInvitations  UserInvitation[]
+    experiments             Experiment[]
+    datasets                Dataset[]
+    loggedCalls             LoggedCall[]
+    apiKeys                 ApiKey[]
 }
 
 enum ProjectUserRole {
@@ -390,16 +391,33 @@ model User {
 
     role UserRole @default(USER)
 
-    accounts          Account[]
-    sessions          Session[]
-    projectUsers      ProjectUser[]
-    projects          Project[]
-    worldChampEntrant WorldChampEntrant?
+    accounts                Account[]
+    sessions                Session[]
+    projectUsers            ProjectUser[]
+    projects                Project[]
+    worldChampEntrant       WorldChampEntrant?
+    sentUserInvitations     UserInvitation[]
 
     createdAt DateTime @default(now())
     updatedAt DateTime @default(now()) @updatedAt
 }
 
+model UserInvitation {
+    id String @id @default(uuid()) @db.Uuid
+
+    projectId String @db.Uuid
+    project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
+    email String
+    role ProjectUserRole
+    invitationToken String @unique
+    senderId String @db.Uuid
+    sender User @relation(fields: [senderId], references: [id], onDelete: Cascade)
+
+    @@unique([projectId, email])
+    createdAt DateTime @default(now())
+    updatedAt DateTime @updatedAt
+}
+
 model VerificationToken {
     identifier String
     token      String   @unique