Docs: Add documentation about Reactive Caching
Problem to solve
Add developer documentation about Reactive Caching and how it should be used, from the backend and frontend perspective.
Further details
Some questions that should be answered by the documentation:
- What should be returned by the API when the reactive cache value is not found (and is being calculated)?
- Under what conditions should the frontend retry the API?
We could also have some documentation describing how to implement Reactive Caching on the backend.