[CLIP] allow loading projection layer in vision and text model (#18962)

* allow loading projection in text and vision model

* begin tests

* finish test for CLIPTextModelTest

* style

* add slow tests

* add new classes for projection heads

* remove with_projection

* add in init

* add in doc

* fix tests

* fix some more tests

* fix copies

* fix docs

* remove leftover from fix-copies

* add the head models in IGNORE_NON_AUTO_CONFIGURED

* fix docstr

* fix tests

* Apply suggestions from code review

Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* add docstr for models

Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

utils/check_repo.py

@@ -177,7 +177,9 @@ IGNORE_NON_AUTO_CONFIGURED = PRIVATE_MODELS.copy() + [
     "PLBartDecoderWrapper",
     "BeitForMaskedImageModeling",
     "CLIPTextModel",
+    "CLIPTextModelWithProjection",
     "CLIPVisionModel",
+    "CLIPVisionModelWithProjection",
     "GroupViTTextModel",
     "GroupViTVisionModel",
     "TFCLIPTextModel",