Support query caching

[yaaraze]

Like apollo library

[barbieri]

it's a great request, but unfortunately this would be (if properly implemented) a huge task I don't have time to implement (PR is welcome).

The issue is how to do it in a generic and extensible way. I'm a user of Apollo/JS on many projects, you have a machinery to specify cache manually, direct cache operations (read/write), keys (ie: __typename + id or something else), connections (for pagination)...

OTOH to do simplistic cases is not hard, but it can't go in a generic library otherwise we start to get bug reports it doesn't cope with more complex uses... so I recommend you to do it yourself if it's simple.