[Feature]: `reasoning_tokens` in Chat Completion Response `usage`

[gaocegege]

🚀 The feature, motivation and pitch

Now we support reasoning outputs, but we do not show the metadata reasoning_tokens in Chat Completion Response usage

{
  "id": "chatcmpl-123456",
  "object": "chat.completion",
  "created": 1728933352,
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hi there! How can I assist you today?",
        "refusal": null
      },
      "logprobs": null,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "completion_tokens_details": {
      "reasoning_tokens": 0,
    }
  },
}

Alternatives

No response

Additional context

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