Output dicts support in text generation pipeline (#35092)
* Support for generate_argument: return_dict_in_generate=True, instead of returning a error
* fix: call test with return_dict_in_generate=True
* fix: Only import torch if it is present
* update: Encapsulate output_dict changes
* fix: added back original comments
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Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>
