We should be able to use other transcription services,
those usually relie on response_format="diarized_json"
to produce what we need.
Note that as part of this change, we stop using
openai library for making this call to avoid
casting the result to a payload that doesn't
contain the elements we used to rely on.
(setting this specific format auto cast the
results in openai lib). We keep the old
result class used.
Florent Chehab