Add image text to text pipeline (#34170)

* Standardize image-text-to-text-models-output

add post_process_image_text_to_text to chameleon and cleanup

Fix legacy kwarg behavior and deprecation warning

add post_process_image_text_to_text to qwen2_vl and llava_onevision

Add post_process_image_text_to_text to idefics3, mllama, pixtral processor

* nit var name post_process_image_text_to_text udop

* nit fix deprecation warnings

* Add image-text-to-text pipeline

* add support for image url in chat template for pipeline

* Reformat to be fully compatible with chat templates

* Add tests chat template

* Fix imports and tests

* Add pipeline tag

* change logic handling of single prompt ans multiple images

* add pipeline mapping to models

* fix batched inference

* fix tests

* Add manual batching for preprocessing

* Fix outputs with nested images

* Add support for all common processing kwargs

* Add default padding when multiple text inputs (batch size>1)

* nit change version deprecation warning

* Add support for text only inference

* add chat_template warnings

* Add pipeline tests and add copied from post process function

* Fix batched pipeline tests

* nit

* Fix pipeline tests blip2

* remove unnecessary max_new_tokens

* revert processing kosmos2 and remove unnecessary max_new_tokens

* fix pipeline tests idefics

* Force try loading processor if pipeline supports it

* revert load_processor change

* hardcode loading only processor

* remove unnecessary try except

* skip imagetexttotext tests for kosmos2 as tiny model causes problems

* Make code clearer

* Address review comments

* remove preprocessing logic from pipeline

* fix fuyu

* add BC resize fuyu

* Move post_process_image_text_to_text to ProcessorMixin

* add guard in post_process

* fix zero shot object detection pipeline

* add support for generator input in pipeline

* nit

* change default image-text-to-text model to llava onevision

* fix owlv2 size dict

* Change legacy deprecation warning to only show when True

tests/utils/tiny_model_summary.json

@@ -2896,7 +2896,7 @@
         "model_classes": [
             "IdeficsForVisionText2Text"
         ],
-        "sha": "2c2f2e2cd6b02a77d0cdd8c3767ba9a6267dbd20"
+        "sha": "a6be81294ff7a3d44f3aef0ed18e42b97c426831"
     },
     "IdeficsModel": {
         "tokenizer_classes": [