AutoImageProcessor (#20111)

* AutoImageProcessor skeleton

* Update references

* Add mapping in init

* Add model image processors to __init__ for importing

* Add AutoImageProcessor tests

* Fix up

* Image Processor documentation

* Remove pdb

* Update docs/source/en/model_doc/mobilevit.mdx

* Update docs

* Don't add whitespace on json files

* Remove fixtures

* Move checking model config down

* Fix up

* Add check for image processor

* Remove FeatureExtractorMixin in docstrings

* Rename model_tmpfile to config_tmpfile

* Don't make None if not in image processor map

docs/source/en/model_doc/vilt.mdx

@@ -38,12 +38,12 @@ Tips:
   This processor wraps a feature extractor (for the image modality) and a tokenizer (for the language modality) into one.
 - ViLT is trained with images of various sizes: the authors resize the shorter edge of input images to 384 and limit the longer edge to
   under 640 while preserving the aspect ratio. To make batching of images possible, the authors use a `pixel_mask` that indicates
-  which pixel values are real and which are padding. [`ViltProcessor`] automatically creates this for you. 
-- The design of ViLT is very similar to that of a standard Vision Transformer (ViT). The only difference is that the model includes 
+  which pixel values are real and which are padding. [`ViltProcessor`] automatically creates this for you.
+- The design of ViLT is very similar to that of a standard Vision Transformer (ViT). The only difference is that the model includes
   additional embedding layers for the language modality.
 
 <img src="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/vilt_architecture.jpg"
-alt="drawing" width="600"/> 
+alt="drawing" width="600"/>
 
 <small> ViLT architecture. Taken from the <a href="https://arxiv.org/abs/2102.03334">original paper</a>. </small>
 
@@ -63,6 +63,11 @@ Tips:
 [[autodoc]] ViltFeatureExtractor
     - __call__
 
+## ViltImageProcessor
+
+[[autodoc]] ViltImageProcessor
+    - preprocess
+
 ## ViltProcessor
 
 [[autodoc]] ViltProcessor