GitLab

* add _torch_extract_fbank_features_batch function in feature_extractor_whisper

* reformat feature_extraction_whisper.py file

* handle batching in single function

* add gpu test & doc

* add batch test & device in each __call__

* add device arg in doc string

---------
Co-authored-by: vaibhav.aggarwal <vaibhav.aggarwal@sprinklr.com>