[WIP] Gemini Structured Outputs

[btumbleson]

Hey folks, this is a bit beyond my comfort zone, but wanted to share my WIP code for structured outputs with Gemini.

This code is working for me with a handful of somewhat complex schemas (I've explicitly used/ tested the Object, Array, String and Number schemas, with nesting), although I acknowledge I haven't attached any tests here (yet).

Some observations that may need to be addressed more meaningfully:

• The ObjectSchema defines an allowAdditionalProperties key which is valid for OpenAI, but not for Gemini. As the schema itself isn't aware of the Provider being chosen, without doing some injection/ facade/ whatever, it was easier to just strip this key out after the toArray() map. There may need to be a longer term decision made here based on how other providers treat their schema definitions, or perhaps a provider-specific map() or toArray() handler for the schema.
• Gemini doesn't appear to have multiple structured options like OpenAI, so the StructuredModeResolver is a bit superfluous. Granted it's still a valid check on if a specific model supports structured mode, but I skipped this logic inclusion in my WIP pass here as all "current" Gemini models (excluding v1 Pro) support structured outputs.

Thoughts on a path forward to formalizing this?

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