Prepare processors for VideoLLMs (#36149)
* allow processor to preprocess conversation + video metadata
* allow callable
* add test
* fix test
* nit: fix
* add metadata frames_indices
* Update src/transformers/processing_utils.py
Co-authored-by: Pablo Montalvo <39954772+molbap@users.noreply.github.com>
* Update src/transformers/processing_utils.py
Co-authored-by: Pablo Montalvo <39954772+molbap@users.noreply.github.com>
* port updates from Orr and add one more test
* Update src/transformers/processing_utils.py
Co-authored-by: Pablo Montalvo <39954772+molbap@users.noreply.github.com>
* typo
* as dataclass
* style
* docstring + maek sure tests green
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Co-authored-by: Pablo Montalvo <39954772+molbap@users.noreply.github.com>
