add ability to have z.record part of structured outputs

[lifeiscontent]

Confirm this is a feature request for the Node library and not the underlying OpenAI API.

• This is a feature request for the Node library

Describe the feature or improvement you're requesting

I'm currently working on a tool that provides edits to records the shape looks like:

model: string[][]

updates to model: Record<number, Record<number, string>>

the reason why this shape is ideal is because we can keep an in-memory lookup of all the "rows" and "columns" that have been edited and z.record is a good use case for this shape because we obviously don't need the entire array to be returned, just the edits. currently when using strict: true inside of a run, this kind of schema fails.

Additional context

No response