[BUG] Total tokens not tallied with DSPy and AzureOpenAI client

[arthurgreef]

Describe the bug
The total tokens count is not tallied when using Phoenix with DSPy and AzureOpenAI.

To Reproduce
Steps to reproduce the behavior:

1. Run phoenix in python session.
2. Trace any DSPy program that uses the AzureOpenAI client, with Phoenix.
3. Open the Phoenix browser app.
4. Total Tokens is '0'

Expected behavior
Expect the total tokens to be tallied from the following completion response.

"created": 1727198954,
  "model": "gpt-4o-2024-08-06",
  "object": "chat.completion",
  "service_tier": null,
  "system_fingerprint": "fp_67802d9a6d",
  "usage": {
    "completion_tokens": 13,
    "prompt_tokens": 609,
    "total_tokens": 622
  },

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: Windows
• Notebook Runtime N/A
• Browser Edge
• Version Latest

Additional context

[axiomofjoy]

Thanks @arthurgreef. This issue is a duplicate of #3119. The recommended workaround is to use our OpenAIInstrumentor in conjunction with DSPyInstrumentor.