Add a GitHub CI cron job that open issues here for new Notion API changelog entries

[ramnes]

Most of the development / maintenance of this package is tied to Notion API changelog.

I already receive a notification every time a change happens in notion-sdk-js (watch ramnes/notion-sdk-js if you want them too), but sometime I misinterpret a commit and skip important changes.

A new issue here every time there's a new entry in the official changelog would be a better way to follow upstream changes!