Onnx support for Zero Shot Classification Pipeline
Hi

Thanks for creating this library.

I am using the Zero Shot Classification Pipeline for my use cases which runs for millions of sentences and I currently use a gpu for faster performance.

Onnx currently supports following pipelines-

SUPPORTED_PIPELINES = [
    "feature-extraction",
    "ner",
    "sentiment-analysis",
    "fill-mask",
    "question-answering",
    "text-generation",
    "translation_en_to_fr",
    "translation_en_to_de",
    "translation_en_to_ro",
]

It would be helpful if I could use onnx runtime to deploy the pipeline. Hence asking for support for Zero Shot Classification Pipeline.
Hello @subhamkhemka, we're moving away from pipeline support in ONNX to support a more easily extendable setup relying on the model themselves. Could you take a look at the new approach and let us know if it works for you? https://huggingface.co/transformers/serialization.html#configuration-based-approach<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.<|||||>@LysandreJik 
Zero Shot Classification is a little bit tricky, is there an example of ONNX configuration for Zero Shot Classification? Thanks