Watch a dataset

Be told each time a dataset gets a new version: Ploti sends a dataset.updated event to the member's webhooks (create_webhook makes one) with the dataset's id, the new version and when it went live. Use it to have an agent check new rows for what the user is after, such as new permits matching their criteria, instead of polling. Watch a dataset find_data found; one the workspace's coverage or plan does not open cannot be watched. Watching again changes nothing. A member may watch 100 datasets.