[zod-nestjs] Recursively convert to OpenAPI 3.0 specification

[erkstruwe]

Hi and sorry I did not fix this right away in #182.

In my project I have a somewhat advanced structure of Zod validation schemes with nested objects and arrays. So far, we only convert OpenAPI 3.1 back to OpenAPI 3.0 for objects and only on the root level, e. g. the properties object. However, schema objects can incorporate other schema objects in a bunch of other places, for example anyOf or items for arrays,

This PR addresses this problem by recursively converting zod-openapi's OpenAPI 3.1 object back to OpenAPI 3.0 for NestJS.

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