feat(genai): controlled generation

[Guiners]

Description

Fixes #

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Checklist

• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Please merge this PR for me once it is approved

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[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• genai/controlled-generation/ctrlgen-with-class-schema.js:17, tag googlegenaisdk_ctrlgen_with_class_schema
• genai/controlled-generation/ctrlgen-with-enum-class-schema.js:17, tag googlegenaisdk_ctrlgen_with_enum_class_schema
• genai/controlled-generation/ctrlgen-with-nested-class-schema.js:17, tag googlegenaisdk_ctrlgen_with_nested_class_schema
• genai/controlled-generation/ctrlgen-with-nullable-schema.js:17, tag googlegenaisdk_ctrlgen_with_nullable_schema
• genai/controlled-generation/ctrlgen-with-resp-schema.js:17, tag googlegenaisdk_ctrlgen_with_resp_schema

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[gemini-code-assist]

Summary of Changes

Hello @Guiners, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a comprehensive set of new samples for the Google GenAI SDK, focusing on the 'controlled generation' feature. These additions provide clear examples of how to structure AI model responses using various schema definitions, enhancing the SDK's utility for developers. Alongside these new features, existing samples have been updated to leverage the latest gemini-2.5-flash model, and corresponding tests have been added or adjusted to maintain robust coverage.

Highlights

• New Controlled Generation Samples: Added five new JavaScript samples demonstrating various ways to use controlled generation with the Google GenAI SDK. These samples showcase defining response schemas using JavaScript classes, enums, nested classes, nullable properties, and direct JSON schema objects.
• Updated GenAI Models: Updated existing samples to use the generally available gemini-2.5-flash model, replacing gemini-2.0-flash and gemini-2.5-flash-preview-05-20.
• New Test Coverage: Introduced dedicated test files for each of the new controlled generation samples to ensure their functionality and correctness.
• Test Timeout Adjustment: Increased the timeout for the tools-code-exec-with-txt.test.js to accommodate potentially longer execution times for code generation and execution.

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[gemini-code-assist]

Code Review

This pull request adds new examples for controlled generation with GenAI. The feedback focuses on improving code consistency (using camelCase), ensuring robust schema definitions and tests, and correcting minor issues in the test setup.

[msampathkumar]

Tagging @gericdong for review