Use `Audio` features for `AutomaticSpeechRecognition` task template
I'm just retaking and working on #2324. 😉  Resolved via https://github.com/huggingface/datasets/pull/4006.
In #2533 we added a task template for speech recognition that relies on the file paths to the audio files. As pointed out by @SBrandeis this is brittle as it doesn't port easily across different OS'. 

The solution is to use dedicated `Audio` features when casting the dataset. These features are not yet available in `datasets`, but should be included in the `AutomaticSpeechRecognition` template once they are.