Remove CLI spams with Whisper FeatureExtractor (#21267)
* Remove CLI spams with Whisper FeatureExtractor
Whisper feature extractor representation includes the MEL filters, a list of list that is represented as ~16,000 lines. This needlessly spams the command line. I added a `__repr__` method that replaces this list with a string "<array of shape (80, 201)>"
* Remove mel_filters from to_dict output
Credits to @ArthurZucker
* remove unused import
* update feature extraction tests for the changes in to_dict