Realtime notifications

Easily get realtime data from your task runs to your frontend (or backend).

This would include basic stuff:

1. Run status

2. Run payload

3. Run output

But also more advanced use cases:

1. Being able to send structured (and typed) data from inside your run functions to your frontend.

2. Being able to stream data from inside your run function to your frontend.

3. Being able to send React Server Components from your run function to you frontend. Maybe. We're trying to figure out if this is possible.