fix: CogVideox train dataset _preprocess_data crop video (#9574)
* Removed int8 to float32 conversion (`* 2.0 - 1.0`) from `train_transforms` as it caused image overexposure.
Added `_resize_for_rectangle_crop` function to enable video cropping functionality. The cropping mode can be configured via `video_reshape_mode`, supporting options: ['center', 'random', 'none'].
* The number 127.5 may experience precision loss during division operations.
* wandb request pil image Type
* Resizing bug
* del jupyter
* make style
* Update examples/cogvideo/README.md
* make style
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Co-authored-by: --unset <--unset>
Co-authored-by: Aryan <aryan@huggingface.co>