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/vit.mdx

@@ -57,7 +57,7 @@ Tips:
   improvement of 2% to training from scratch, but still 4% behind supervised pre-training.
 
 <img src="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/model_doc/vit_architecture.jpg"
-alt="drawing" width="600"/> 
+alt="drawing" width="600"/>
 
 <small> ViT architecture. Taken from the <a href="https://arxiv.org/abs/2010.11929">original paper.</a> </small>
 
@@ -96,6 +96,12 @@ go to him!
 [[autodoc]] ViTFeatureExtractor
     - __call__
 
+
+## ViTImageProcessor
+
+[[autodoc]] ViTImageProcessor
+    - preprocess
+
 ## ViTModel
 
 [[autodoc]] ViTModel