Improve the subscription API of job-xsweet with payload manipulation
https://github.com/apollographql/graphql-subscriptions#payload-manipulation
Currently, you need to request the completed job after the last state is received via the submission - this is because pubsub payloads are limited to 8000 bytes (which might not be enough to carry the entire converted HTML). However, there is a way to jump in to the subscription payload and manipulate it before it goes to the client. This would simplify the API significantly.