[feat] Add FLAVA model (#16654)

* [WIP] Add FLAVA model

This PR aims to add [FLAVA](ihttps://arxiv.org/abs/2112.04482) model to the transformers repo.

Following checklist delineates the list of things to be done for this PR
to be complete:

[x] Flava init
[x] Flava base models
[x] Flava layers
[x] Flava Configs
[x] Flava encoders
[x] Flava pretraining models
[ ] Flava classification/retrieval models (To be added in a separate PR)
[x] Documentation updates 
[x] Imports updates 
[x] Argstring updates
[x] Flava pretrained checkpoints 
[x] Flava tests
[x] Flava processors 
[x] Sanity check
[x] Lint

utils/check_repo.py

@@ -146,6 +146,10 @@ IGNORE_NON_AUTO_CONFIGURED = PRIVATE_MODELS.copy() + [
     "DetrForSegmentation",
     "DPRReader",
     "FlaubertForQuestionAnswering",
+    "FlavaImageCodebook",
+    "FlavaTextModel",
+    "FlavaImageModel",
+    "FlavaMultimodalModel",
     "GPT2DoubleHeadsModel",
     "LukeForMaskedLM",
     "LukeForEntityClassification",