[WIP] Require serialization/deserialization functions for custom scalars

[captbaritone]

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Fixes https://github.com/captbaritone/grats/issues/66

TODO

• [ ] Rename args in @-exports directive to be more generic
• [ ] Clean up codegen
• [ ] Check/fix integration tests
  • [ ] Test all serialization/deserialization validation failure cases
• [ ] Add unit test validating the error you get when you don't export your type
• [ ] Revisit docs

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