Support decoder generated with `--for-ort` from `optimum.exporters.onnx` in `ORTDecoder` (#554)
* add support
* cleaning
* remove useless import
* remove print
* styling post merge
* Update optimum/onnxruntime/modeling_decoder.py
Co-authored-by: Michael Benayoun <mickbenayoun@gmail.com>
* simplify multiple ONNX export
* fix path
* avoid code duplicate, better doc
* fix and simplify test
Co-authored-by: Michael Benayoun <mickbenayoun@gmail.com>