[ENHANCEMENT] langchain tracing option to display the raw openai JSON messages.

[taoari]

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When I enabled tracing for Langchain's ChatOpenAI, the input and output were shown in LangChain's custom JSON format (see screenshot). However, this format is cluttered with unnecessary details, making it hard to follow. What I need is access to the original OpenAI API calls, which are much cleaner and more familiar to developers. Since OpenAI tracing is already supported in Phoenix, having the option to view the raw OpenAI JSON messages would significantly simplify debugging. Moreover, the OpenAI API has become a standard that other frameworks, like vLLM and HuggingFace’s text generation interface, are adopting.

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This screenshot below is for OpenAI tracing, it's JSON format is much cleaner (simply messages of "role" and "content"). I would expect when I click on ChatOpenAI, it will show cleaner messages like this.

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