Support examples codegen for tool decorator

[devin-ai-integration]

Adds codegen support for the examples parameter in the @tool decorator, complementing PR #3350 which adds runtime support. When a CODE_EXECUTION function has examples defined in definition.parameters.examples, the codegen generates the appropriate tool(inputs={...}, examples=[...]) wrapper.

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• Requested by: @vincent0426
• Session: https://app.devin.ai/sessions/5bc1e9c6933548168e1b72ba33723f74

Review & Testing Checklist for Human

• Verify the backend/frontend sends examples in definition.parameters.examples (JSON Schema examples keyword) - the codegen reads from this path
• Test end-to-end by pulling a workflow that has a tool with both inputs and examples defined and verify the generated code is valid Python
• Confirm the generated tool(inputs={...}, examples=[...]) matches what PR Support examples in tool decorator #3350's runtime decorator expects

Notes

This PR only handles examples for CODE_EXECUTION function types. Other function types (INLINE_WORKFLOW, WORKFLOW_DEPLOYMENT, etc.) do not support examples.

[devin-ai-integration]

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