When Returning Effective Type from the SDK Fill in Generics and Compute Effective Objects

[KetanReddy]

All of the logic that we do in validation to fill in generics, compute the effective object results from intersections/unions and solve the extends notation for ObjectType nodes we should all compute when we return an object from the SDK. Currently we only expand the extends notation but by doing all the other operations we can return a more useful type for some operations (like generating JSON that fills in some of those objects in drag and drop). If we compute these objects when retrieving them from the SDK, they should also be added to the cache used for validation in #24.