Add Fast Image Processor for mobileViT (#37143)

* Add image_processing_mobilevit_fast.py

* Fix copies

* update _preprocess for channel_flip

* Update for batched image processing

* Resolve merge conflicts with main

* Fix import order and remove trailing whitespace (ruff clean-up)

* Fix copy inconsistencies

* Add NotImplementedError for post_process_semantic_segmentation to satisfy repo checks

* Add auto_docstring

* Adjust style

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

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

* Update src/transformers/models/mobilevit/image_processing_mobilevit_fast.py

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

* Update src/transformers/models/mobilevit/image_processing_mobilevit_fast.py

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

* Delete not used function

* test: add missing tests for  and

* Add post_process_semantic_segmentation to mobilevit_fast.py

* Add preprocess function to image_processing_mobilebit_fast.py

* ruff check for formatting

* fix: modify preprocess method to handle BatchFeature correctly

* Remove logic for default value assignment

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

* Remove normalization adn RGB conversion logic not used in slow processor

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

* Simplify return_tensors logic using one-liner conditional expression

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

* Remove unused normalization and format parameters

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

* add **kwargs and remove default values in _preprocess

* add slow_fast equivalence tests for segmentation

* style: autoformat code with ruff

* Fix slow_fast equivalence test

* merge + remove skipped test

---------

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

docs/source/en/model_doc/mobilevit.md

@@ -95,6 +95,12 @@ If you're interested in submitting a resource to be included here, please feel f
     - preprocess
     - post_process_semantic_segmentation
 
+## MobileViTImageProcessorFast
+
+[[autodoc]] MobileViTImageProcessorFast
+    - preprocess
+    - post_process_semantic_segmentation
+
 <frameworkcontent>
 <pt>