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Merge google#1067

🤖 I have created a release *beep* *boop*
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### Updating meta-information for bleeding-edge SNAPSHOT release.

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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

COPYBARA_INTEGRATE_REVIEW=google#1067 from google:release-please--branches--main 0b85f5b
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This CL enables the simultaneous use of `output_schema` (structured output) and `tools` for models that do not natively support both features at once (specifically Gemini 1.x and 2.x on Vertex AI).

### Core Logic
The CL implements a workaround for models with this limitation:
1.  **Synthetic Tooling**: Instead of passing the `output_schema` directly to the model's configuration, it introduces a synthetic tool called `set_model_response`.
2.  **Schema Injection**: The parameters of this tool are set to the requested `output_schema`.
3.  **Instruction Prompting**: System instructions are appended, directing the model to provide its final response using this specific tool in the required format.
4.  **Response Interception**: The `BaseLlmFlow` is updated to check if `set_model_response` was called. If so, it extracts the JSON arguments and converts them into a standard model response event.

### Key Changes
*   **`OutputSchema.java` (New)**: A new `RequestProcessor` that detects when the workaround is needed, adds the `SetModelResponseTool`, and provides utilities for extracting the structured response.
*   **`SetModelResponseTool.java` (New)**: A marker tool that simply returns its input arguments, used to "capture" the structured output from the model.
*   **`ModelNameUtils.java`**: Added logic to identify Gemini 1.x and 2.x models and determine if they can handle native `output_schema` alongside tools.
*   **`BaseLlmFlow.java`**: Updated the flow logic to detect the synthetic tool response and generate the final output event.
*   **`Basic.java`**: Updated to prevent native `outputSchema` configuration when the workaround is active.
*   **`SingleFlow.java`**: Registered the new `OutputSchema` processor.

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