Research preview streaming with the new Generator Handler

[davefojtik]

RunPod's new Generator Handler allows fetching /stream endpoint to get continuous updates on a job without the need for RunPod to send updates to your server as it had to be done previously.

The maximum size for a payload that can be sent using yield to stream results is 1 MB.

Needed steps are:

• Check if this limit is not exceeded in any situation.
• Change the handler type to the Generator one
• Add code that will yield previews to the handler
• Test it