Better use of available data instead of making unnecessary requests

[dzucconi]

In many cases we blindly fetch an object from Gravity instead of using an already available embedded result that might be present. Currently we sometimes "optimize" for this by passing shallow: true where we can be sure of an existing embedded result: https://github.com/artsy/metaphysics/blob/f17563ec3c62190594678999864385ae90b9398c/schema/artwork/index.js#L256-L267

However it's likely possible to make this optimization automatically by inspecting the query and available data.

[alloy]

This sounds like a good idea, but as is always the case with optimisation, I’d first like to know how much impact this would actually have in our case.