Support Zod Codecs

[Baterka]

I would love to see support for Zod Codecs (https://zod.dev/codecs).
It would efectivelly make customJsonSerializers obsolete as contracts itself would be able to define encode/decode bidirectional schemas that oRPC can then use to decode inputs and encode outputs.

[dinwwwh]

This looks very similar to the approach described here: https://orpc.dev/docs/openapi/advanced/expanding-type-support-for-openapi-link - did I miss anything?