Add ImageProcessorFast to BiT processor (#37180)

* Add ImageProcessorFast to BiT processor

* propose a fast processor and add tests

* all tests pass except one

* run make

* remove useless print

* use same test as clip

* apply make

* Update src/transformers/models/bit/image_processing_bit_fast.py

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

* Update setup.py

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

* Update src/transformers/models/bit/image_processing_bit_fast.py

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

* apply review comment

---------

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

docs/source/en/model_doc/bit.md

@@ -58,6 +58,11 @@ If you're interested in submitting a resource to be included here, please feel f
 [[autodoc]] BitImageProcessor
     - preprocess
 
+## BitImageProcessorFast
+
+[[autodoc]] BitImageProcessorFast
+    - preprocess
+
 ## BitModel
 
 [[autodoc]] BitModel