alias timestamp_granularities[] does not actually work

[sreeprasannar]

This ends up breaking the non-aliased version as well - this means regardless of what you set in timestamp_granularities you'll always have the default value of [segment]

This leads to the issues we see in #29, #58

The core issue could be the special characters in Form(alias=) - but I can find several sources that claim that this should work - fastapi/fastapi#5765

This warrants more exploration so I added two tests. To demonstrate the problem with the alias, I removed it in this PR and one of the tests pass.

[sreeprasannar]

More surprising is that the OpenAI api requires this to work:

 transcript = client.audio.transcriptions.create(
                model="Systran/faster-distil-whisper-large-v3",
                file=audio_bytes,
                timeout=max_request_timeout,
                response_format="verbose_json",
                timestamp_granularities="word"
            )

Note the timestamp_granularities="word" and not an array.

[fedirz]

This has been addressed in #89. Thanks for creating a pr!