`serde` usage with anonymous structs

[d3rpp]

I can see a great use case of this library being for API Types in a more rapid & c-like/go-like style, though the only real barrier being the lack of compatibility with serde.

I've set up a fork which adds serde compatibility via a feature by just forcing serde implementation on every generated struct, though I can see how this could cause issues.

Is there anything you've thought of that may do the job a bit better, the tests work on this solution though I can see thius becoming quite cumbersome if more people start needing more features and more derivations, etc.