Add whisper converter for hf -> openai
### Feature request

The inference pipeline in openai whisper has a couple of heuristics that aren't all covered in https://github.com/huggingface/transformers. Therefore, some users would like to fine-tune in huggingface and convert the model back to its original configuration.

https://github.com/huggingface/transformers/blob/main/src/transformers/models/whisper/convert_openai_to_hf.py provides a script to convert from openai to hf, so we should also have a script to go the other way.

### Motivation

It is difficult to get the same transcription quality in the current transformers library compared to the openai transcribe function https://github.com/openai/whisper/blob/main/whisper/transcribe.py.

### Your contribution

there is an existing approach in https://github.com/luigisaetta/whisper-app/blob/main/match_layers.py by @luigisaetta 
👋 @ArthurZucker, who created the conversion script
 <|||||>Hey! I am not entirely sure if we should have this in our repo or just link it in the readme, but I think a contributor already wrote a script so pinging @bayartsogt-ya here.<|||||>For visibility, whisper.cpp provides conversion from HF models into their format.
It's much high performing that OpenAI implementation. See: https://github.com/ggerganov/whisper.cpp/tree/master/models<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>I've seen a lot of converter codes flying around. Also given that tranformers is catching up with respect to timestamp outputs there is not much need to use whisper itself for inference anymore<|||||>@faroit could you add a link to a conversion script? Just so if people end up here, they find what they are looking for.