Fix #5957 - Add structured output support for AzureAIChatCompletionClient

[Whning0513]

Add support for structured output for AzureAIChatCompletionClient

Feature request from maintainer ekzhu: The AzureAIChatCompletionClient does not support structured output (JSON schema-guided response format), while OpenAIChatCompletionClient already has this capability. The request is to add comparable structured output support to the Azure AI client.

Filed by: ekzhu (maintainer)

The AzureAIChatCompletionClient implementation was missing the response_format handling in its create() and create_stream() methods. The Azure AI Inference SDK supports ChatCompletionsResponseFormat parameters, but the AutoGen client wrapper did not translate Pydantic model schemas into the required Azure SDK format objects.

File: python/packages/autogen-ext/src/autogen_ext/models/azure/_azure_ai_client.py

• Added response_format handling in model creation calls
• Added JSON schema serialization support compatible with the Azure AI Inference SDK
• Updated the create and create_stream methods to pass structured output configuration

Low - The change adds a new feature (structured output) in a backward-compatible manner. Existing plain-text and JSON-object mode outputs continue to work unchanged. Only users who explicitly pass a Pydantic model or JSON schema as response_format will be affected by the new code path.

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