Add support for timestamp granularities for Create Transcriptions endpoint

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Feature Request

Is your feature request related to a problem? Please describe.

OpenAI has added support for timestamp granularities, "word" or "segment", to the Create Transcriptions endpoint. Documented here: https://platform.openai.com/docs/api-reference/audio/createTranscription

Describe the solution you'd like

Allow passing "word", "segment" or both to the Create Transcriptions endpoint.

Describe alternatives you've considered

Right now I will have to access the OpenAI API directly to use this feature. It is a bit cumbersome, which is why I use this library!

Additional context

N/A

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@StephenHodgson

Thank you for adding support for this. It is very much appreciated!