Hi! I'm using a self-hosted Prefect server and I'd like to receive all changes in a flow (and its tasks) through a webhook (or similar) notification. I don't want to define notifications in the code of my flows because I want them to apply to all flows. Notifications work on state changes of a flow, but not on the changes of its tasks (when a task starts, finishes, etc.). Also, I understand that I can't define custom states that can trigger the notification. Is there any way to achieve this in the self-hosted version? Even if I have to code it myself, can you point me in the right direction? Thank you!