Delete or "clean" the chat

I would like a function that would allow you to delete or indeed "clean" an entire chat without having to delete message by message.

a function like on telegram would be fantastic, where when you want to delete a chat a window pops up asking if you want to delete the chat for both users or just for yourself.

at the moment you can only delete single messages and it's fine for "small" chats, but for chats that may have lasted for years I think you need a function that allows you to delete all messages in a single move.