Message API - list and fetch incoming messages to support AI responses

The API currently lets you send messages, and reply if you have a thread ID, but there is no way of getting the thread ID.

There is currently no way of listing and fetching new messages via the API. I currently work around this by scraping the website, but this workflow is terrible.

By adding The ability to read messages via the API, it paves the way to create plugins for smarter automated responses.