Add optimized PixtralImageProcessorFast (#34836)

* Add optimized PixtralImageProcessorFast

* make style

* Add dummy_vision_object

* Review comments

* Format

* Fix dummy

* Format

* np.ceil for math.ceil

docs/source/en/_config.py

@@ -11,4 +11,4 @@ black_avoid_patterns = {
     "{processor_class}": "FakeProcessorClass",
     "{model_class}": "FakeModelClass",
     "{object_class}": "FakeObjectClass",
-}
+}

docs/source/en/model_doc/pixtral.md

@@ -88,6 +88,11 @@ output = processor.batch_decode(generate_ids, skip_special_tokens=True, clean_up
 [[autodoc]] PixtralImageProcessor
     - preprocess
 
+## PixtralImageProcessorFast
+
+[[autodoc]] PixtralImageProcessorFast
+    - preprocess
+
 ## PixtralProcessor
 
 [[autodoc]] PixtralProcessor