feat(zod): adds zx.convertCaseCodec, zx.deepCamelCaseCodec and zx.deepSnakeCaseCodec

[ahrjarrett]

Closes #522

new features

• zx.convertCaseCodec
• zx.deepCamelCaseCodec (experimental)
• zx.deepSnakeCaseCodec (experimental)

This change adds a new transformer for the @traversable/zod package that uses a new feature that was added in zod v4: codecs.

Because of how easy zx.fold is to work with, implementing zx.convertCaseCodec was relatively simple, and took me about an hour.

Usually I'd fuzz test the hell out of it before publishing, but this time I figured I'd release these early, to have a chance for users to use it and provide feedback before I go through the trouble.

Note

Currently there is no type-level support for these transformers. I'm still trying to decide if doing that would be a good idea.

My current thinking is that it would be better to implement .writeable variants (for example, zx.deepCamelCaseCodec.writeable) – if we did that, it would be trivial to also generate the to/from types as well using zx.toType.

If you use this and run into any problems, please don't hesitate to open an issue!

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commit: c70e3d1