Add TF2 version of FlauBERT (#2700)

* Add TF2 version of FlauBERT

* Add TF2 version of FlauBERT

* Add documentation

* Apply style and quality

* Apply style once again

Co-authored-by: Lysandre Debut <lysandre@huggingface.co>

src/transformers/__init__.py

@@ -220,14 +220,6 @@ if is_torch_available():
         RobertaForQuestionAnswering,
         ROBERTA_PRETRAINED_MODEL_ARCHIVE_MAP,
     )
-    from .modeling_camembert import (
-        CamembertForMaskedLM,
-        CamembertModel,
-        CamembertForSequenceClassification,
-        CamembertForTokenClassification,
-        CamembertForQuestionAnswering,
-        CAMEMBERT_PRETRAINED_MODEL_ARCHIVE_MAP,
-    )
     from .modeling_distilbert import (
         DistilBertPreTrainedModel,
         DistilBertForMaskedLM,
@@ -400,6 +392,13 @@ if is_tf_available():
         TF_CAMEMBERT_PRETRAINED_MODEL_ARCHIVE_MAP,
     )
 
+    from .modeling_tf_flaubert import (
+        TFFlaubertModel,
+        TFFlaubertWithLMHeadModel,
+        TFFlaubertForSequenceClassification,
+        TF_FLAUBERT_PRETRAINED_MODEL_ARCHIVE_MAP,
+    )
+
     from .modeling_tf_distilbert import (
         TFDistilBertPreTrainedModel,
         TFDistilBertMainLayer,