[`Whiper`] add `get_input_embeddings` to `WhisperForAudioClassification` (#22133)
* add `get_input_embeddings` to `WhisperForAudioClassification`
* add common tests
* fix another common test
* Update tests/models/whisper/test_modeling_whisper.py
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
* fix style
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Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>