fix(openai): usage parsing for streamed responses

[hassiebp]

Important

Adds usage_details key to _create_langfuse_update() in langfuse/openai.py for detailed usage data.

• Behavior:
  • In langfuse/openai.py, _create_langfuse_update() now adds usage_details key with parsed usage data, in addition to usage key.
• Misc:
  • No other changes or refactoring in the code.

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Greptile Summary

Disclaimer: Experimental PR review

Updates OpenAI integration to fix usage parsing for streamed responses, ensuring consistent token tracking across different response types and maintaining backward compatibility.

• Modified langfuse/openai.py to store usage data in both 'usage' and 'usage_details' fields for backward compatibility
• Added support for token details in OpenAiCompletionUsageSchema and OpenAiResponseUsageSchema
• Updated usage parsing logic in _create_langfuse_update function to handle streamed responses correctly

[greptile-apps]

LGTM

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