feat(invites): add group/channel invite links and join by token

app/database/models.py

@@ -1,5 +1,5 @@
 from app.auth.models import EmailVerificationToken, PasswordResetToken
-from app.chats.models import Chat, ChatMember, ChatUserSetting
+from app.chats.models import Chat, ChatInviteLink, ChatMember, ChatUserSetting
 from app.email.models import EmailLog
 from app.media.models import Attachment
 from app.messages.models import Message, MessageHidden, MessageIdempotencyKey, MessageReaction, MessageReceipt
@@ -9,6 +9,7 @@ from app.users.models import User
 __all__ = [
     "Attachment",
     "Chat",
+    "ChatInviteLink",
     "ChatMember",
     "ChatUserSetting",
     "EmailLog",