Add support for Whisper external model download

[anandhu-eng]

Add support for downloading the OpenAI whisper model from HuggingFace here

Native command in inference repo:

export CHECKPOINT_PATH=whisper-large-v3
git lfs install
git clone https://huggingface.co/openai/whisper-large-v3 ${CHECKPOINT_PATH}
cd ${CHECKPOINT_PATH} && git checkout 06f233fe06e710322aca913c1bc4249a0d71fce1