Add encoder-decoder model export and inference (#851)
* add encoder decoder model
* update tests
* update docs and tests
* fixed tests
* update tests
* update tests
* update tests
* update tests
* update tests
* update tests
* Update tests/onnxruntime/test_modeling.py
Co-authored-by: fxmarty <9808326+fxmarty@users.noreply.github.com>
* Apply suggestions from code review
Co-authored-by: fxmarty <9808326+fxmarty@users.noreply.github.com>
* udpate testt
* change seq2seq-lm to text-generation
* fix task
* fic tests
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Co-authored-by: Mohit Sharma <mohit@huggingface.co>
Co-authored-by: fxmarty <9808326+fxmarty@users.noreply.github.com>
