Add support for cached_tokens in the Usage model for OpenAI responses #1516
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This change introduces a new field for tracking cached tokens in the
OpenAI API response. It extends the Usage record to include
PromptTokensDetails, allowing for more granular token usage
reporting. The OpenAiUsage class is updated to expose this new data,
and corresponding unit tests are added to verify the behavior.
This enhancement provides more detailed insights into token usage,
indicating how many of the prompt tokens were a cache hit.
Fixes #1506