onnxruntime

Support ONNX export of OpenAi Whisper model (#17316)

Build from source and run the command below

Example, converting whisper-base
`
python -m onnxruntime.transformers.models.whisper.convert_to_onnx -m
openai/whisper-base --model_impl openai -e -o -w --chain_model --output
./demo`