Add a fix for custom code tokenizers in pipelines (#32300)
* Add a fix for the case when tokenizers are passed as a string
* Support image processors and feature extractors as well
* Reverting load_feature_extractor and load_image_processor
* Add test
* Test is torch-only
* Add tests for preprocessors and feature extractors and move test
* Extremely experimental fix
* Revert that change, wrong branch!
* Typo!
* Split tests
