Add-whisper-conversion
# What does this PR do?
Add the conversion script from whisper which was deleted during the sprint. See this [commit](https://github.com/huggingface/transformers/pull/19166/commits/f92b9a8181f9a84114becd31a5a4210723cdf1ad).
This will help for the Whisper Event! 
See the new checkpoints : https://huggingface.co/openai/whisper-large-v2 <|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_20600). All of your documentation changes will be reflected on that endpoint.