[Feature] _get_pixel_values needs to return tgt_sizes

[huangzl18883]

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Motivation

For some multi-modal models like minicpmv-2.6, it is necessary to obtain tgt_sizes when processing images, but the current _get_pixel_values only returns pixel_values and not tgt_sizes

Refer to https://huggingface.co/openbmb/MiniCPM-V-2_6/blob/4e4be000cd81feda8b96d14b53f1791b4010b038/image_processing_minicpmv.py#L415

Related resources

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[merrymercy]

Thanks for reporting this. Contributions are welcome!