Make usage of name field in OpenAI messages optional in OpenAIChatCompletionClient

[ekzhu]

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Issue body

Many "openai-compatible" model providers don't support the name field in message.

e.g, https://console.groq.com/docs/openai

Add include_name_in_message parameter to BaseOpenAIChatCompletionClient, and add to BaseOpenAIClientConfiguration. Default should be True.

Then, in user_message_to_oai and assistant_message_to_oai, we decide whether to use the name field based on the option set.

autogen/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py

Lines 182 to 183 in 4835321

	name=message.source,
	)

autogen/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py

Line 222 in 4835321

name=message.source,

For model APIs that don't support this field, we document in the usage guide about this option.

[tongyu0924]

Can I work on this issue?

[ekzhu]

Sure.