Support batched input for decoder start ids (#28887)
* support batched input for decoder start ids
* Fix typos
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>
* minor changes
* fix: decoder_start_id as list
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Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>