Add Fast Image Processor for VideoMAE

[miguelscarv]

What does this PR do?

This PR implements a FastImageProcessor for the the VideoMAE model using BaseImageProcessorFast. Related #36978

Note:

1. I was not able to run test_can_compile_fast_image_processor as I'm using a M1 and don't have access to a NVIDIA GPU.
2. The test implemented in the method test_slow_fast_equivalence_batched is only able to pass when all images in the batch have a fixed width and height (by setting equal_resolution=True in the self.image_processor_tester.prepare_image_inputs). If the width and height vary across videos, then there is a low chance of passing this test, i.e. it doesn't fail every time.

Other than that, all tests passed.

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@yonigozlan

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[miguelscarv]

Hey @yonigozlan

Saw in #37611 that fast processors for video models aren't being merged, so guessing this PR won’t go through either.

That said, would a fast image processor make sense for SmolVLM? It handles high-res images, so it could help.