feat(google-vertexai): support Gemini propertyOrdering in withStructu…

[thomasrowe5]

…redOutput

Fixes # (issue)

Adds automatic property ordering inference for Gemini structured outputs when using Zod schemas.

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[christian-bromann]

@thomasrowe5 it seems that there are still a lot of un-relevant changes, can we revert them to only focus on the actual issue?

[hntrl]

If I'm reading this right, you have to specify propertyOrdering as a property on the schema object to enable this?

z.object({
  propertyOrdering: z.something()
});