fix(zod-openapi): do not mutate original schema with extendApi

[Ugzuzg]

I was trying to describe some fields of the same "primitive" type that I created with zod in different places of the API, but extendApi was overriding the description on that type instead of changing the description for that specific use case.

A solution is to not mutate the original schema with extendApi.

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[Brian-McBride]

@Ugzuzg Can you resolve the conflicts and push again? This seems like a logical fix.

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[Ugzuzg]

@Brian-McBride, it is done.