Add `tokenizer_kwargs` argument to the text generation pipeline (#40364)
* Add `tokenizer_kwargs` arg to text generation pipeline.
* chore: re-run CI
* Rename `tokenizer_kwargs` to `tokenizer_encode_kwargs` for text generation pipeline
* Fix `tokenizer_encode_kwargs` doc string.
* Fix note related to `tokenizer _kwargs` in text generation pipeline
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Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>