Feat: Listen to new message

[soranoo]

Hi, thank you for creating such an amazing project. Love it~

It would be nice to have a function to listen to new messages.

async listenToNewMessage(onNewMessage: (msg:ElementHandle | Message) => void,isRaw: bool): Promise<void> {
        // Implementation
    }

I know it can be done by subscribing waitElement after every message received, but it comes with a big disadvantage which is unable to handle message concurrency.

Please consider this feature.