Parse scalars for no-cache queries

[jerelmiller]

I'm putting this up as a topic of discussion. It handles parsing custom scalars for no-cache queries, but comes at the cost that it runs on every response for every query. We would likely need an additional API from the cache that tells us when scalars are configured so that we can skip the work when a user isn't using scalars.

If we choose not to go this route, we'll need at least a TypeScript solution in place that can handle choosing the serialized types for custom scalar fields, that way users can handle the parsing logic in their apps as needed. This requires additional work in codegen to make work.

Note

This is an experiment and might not make it into the 4.3 release. We are still evaluating whether this makes sense.

[apollo-librarian]

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