Suggestion to include tiktoken token counting support

[practicehelps]

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Is your feature request related to a problem? Please describe.
For billing the open ai API calls, wondering if one could integrate the tiktoken go ported library:
https://github.com/pkoukk/tiktoken-go

Describe the solution you'd like
https://github.com/pkoukk/tiktoken-go seems to have the token counting support

Describe alternatives you've considered
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Additional context
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