Feat: auto merge long replay.

[lychees]

Due to bandwidth issues, replies are often broken into multiple paragraphs and require human help to finish, which makes the user experience poor. This is a intended behavior for ChatGPT but we might make it better here. A possible solution would be to have the BOT in the state of being spoken(AI is typing...), and automatically complete the conversation(By editing).

[MaikoTan]

The problem is, editing a message is not available on every platforms, and there aren't a general interface to do the such thing.
I personally don't want to add much "platform-related things" to this plugin currently, so I hope this can be implemented in another way, or a common message editing interface that supports various platforms provided by other plugins.