Fix #7418 - Preserve extra_body and extra_headers in OpenAI client config deserialization

[Whning0513]

extra_body in OpenAIChatCompletionClient config is silently ignored when loaded via AutoGen Studio JSON

When configuring a model client through AutoGen Studio's JSON editor with an extra_body field (e.g., to pass enable_thinking: false to a Qwen3-compatible endpoint), the field is silently dropped during deserialization. The extra parameters never reach the underlying HTTP request, even though the same configuration works correctly when instantiated directly via Python.

Reported by: danmaxis

The OpenAIChatCompletionClient configuration model (_init_config.py) and its deserialization path (_openai_client.py) did not include extra_body or extra_headers in the TypedDict schema or the config forwarding logic. When loading from JSON (e.g., AutoGen Studio's load_component()), these fields were unrecognized and silently dropped.

File 1: _init_config.py

• Added extra_body and extra_headers fields to the CreateArguments TypedDict to ensure they are included in the configuration schema

File 2: _openai_client.py

• Updated OpenAIChatCompletionClient to forward extra_body and extra_headers from the config through to the underlying OpenAI API calls in both create() and create_stream() methods

Low - The change adds passthrough support for two optional configuration fields that were previously being silently dropped. No existing behavior is modified, and the fields only take effect when explicitly provided by the user.

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