Add Fast Image Processor for vilt (#37304)

* init vilt image processor fast

* Refactor image processor tests to use loop for all processors

* Add ViltImageProcessorFast with PyTorch-based optimized image processing

* Change made automatically by make fixup command

* Change made automatically by make fix-copies command

* Fix type hints in ViltImageProcessorFast for Python compatibility

* Define constants for image resizing based on COCO dataset aspect ratio

* Add missing property initializations to ViltImageProcessorFast

* Extract resize logic into dedicated method in ViltImageProcessorFast

* Extract padding logic into dedicated method

* Implement shape-based image grouping for optimized processing in Vilt

* Update test suite to verify ViltImageProcessorFast attributes

* Move variable declarations to _preprocess method parameters

* Remove unused parameters

* Rename _resize method to resize to override existing function

* Remove whitespace

* Remove unnecessary type check and conversion for stacked_images

* Remove redundant loop and apply padding directly to stacked images

* Refactor pad function to return images and mask as tuple instead of dict

* Add tests comparing padding masks in slow and fast implementations

* Update ViltImageProcessor tests to ensure compatibility between slow and fast implementations

* Replace add_start_docstrings with auto_docstring in ViltImageProcessorFast

* Move docstrings of custom args to ViltFastImageProcessorKwargs

* Use reorder_images function for both masks and images

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Co-authored-by: Yoni Gozlan <74535834+yonigozlan@users.noreply.github.com>

docs/source/en/model_doc/vilt.md

@@ -72,6 +72,11 @@ This model was contributed by [nielsr](https://huggingface.co/nielsr). The origi
 [[autodoc]] ViltImageProcessor
     - preprocess
 
+## ViltImageProcessorFast
+
+[[autodoc]] ViltImageProcessorFast
+    - preprocess
+
 ## ViltProcessor
 
 [[autodoc]] ViltProcessor