Add FlaxCLIP (#11883)

* add flax CLIP

* default input_shape

* add tests

* fix test

* fix name

* fix docs

* fix shapes

* attend at least 1 token

* flax conv to torch conv

* return floats

* fix equivalence tests

* fix import

* return attention_weights and update tests

* fix dosctrings

* address patricks comments

* input_shape arg

* add tests for get_image_features and get_text_features methods

* fix tests

utils/check_repo.py

@@ -93,6 +93,8 @@ IGNORE_NON_AUTO_CONFIGURED = [
     # models to ignore for model xxx mapping
     "CLIPTextModel",
     "CLIPVisionModel",
+    "FlaxCLIPTextModel",
+    "FlaxCLIPVisionModel",
     "DPRReader",
     "DPRSpanPredictor",
     "FlaubertForQuestionAnswering",