Add fetch_policy=... to use_query

[Archmonger]

Current Situation

There currently isn't a native way to cache or defer execution of a use_query call.

Proposed Actions

Mimic behavior of apollo's useQuery fetch policies within our use_query hook.

The only parameters that make sense to carry over are:

• cache-first
• cache-only
• no-cache

[Archmonger]

If I developed these caching features as generics that could be ported to ReactPy core later, then we don't really have a good method of developing this in a multiprocessing compatible way.

And then if I think about this as a Django-specific feature, then it doesn't make much sense. Package already exist for caching ORM queries in a far more robust manner.

Closing this issue. If our situation changes in the future we can re-open this issue.