add support for TokenUsage through callbacks #137
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- added OpenAI.stream_options support - support TokenUsage on streamed and not streamed
- for new callbacks - added support TokenUsage
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LangChain.TokenUsagefor tracking input and output tokens for a chat completion:on_llm_token_usageto notify when token information is receivedToken information is returned in different ways from each model. The biggest challenge is how it's returned with streaming deltas. More extensive changes were needed to make it work well.