Reorganize file utils (#16264)

* Split file_utils in several submodules

* Fixes

* Add back more objects

* More fixes

* Who exactly decided to import that from there?

* Second suggestion to code with code review

* Revert wront move

* Fix imports

* Adapt all imports

* Adapt all imports everywhere

* Revert this import, will fix in a separate commit

tests/bart/test_modeling_bart.py

@@ -22,8 +22,8 @@ import unittest
 import timeout_decorator  # noqa
 
 from transformers import BartConfig, is_torch_available
-from transformers.file_utils import cached_property
 from transformers.testing_utils import require_sentencepiece, require_tokenizers, require_torch, slow, torch_device
+from transformers.utils import cached_property
 
 from ..generation.test_generation_utils import GenerationTesterMixin
 from ..test_configuration_common import ConfigTester

tests/bart/test_modeling_tf_bart.py

@@ -18,8 +18,8 @@ import unittest
 import numpy as np
 
 from transformers import BartConfig, BartTokenizer, is_tf_available
-from transformers.file_utils import cached_property
 from transformers.testing_utils import require_tf, slow
+from transformers.utils import cached_property
 
 from ..test_configuration_common import ConfigTester
 from ..test_modeling_tf_common import TFModelTesterMixin, ids_tensor

tests/bart/test_tokenization_bart.py

@@ -16,9 +16,9 @@ import os
 import unittest
 
 from transformers import BartTokenizer, BartTokenizerFast, BatchEncoding
-from transformers.file_utils import cached_property
 from transformers.models.roberta.tokenization_roberta import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, require_torch
+from transformers.utils import cached_property
 
 from ..test_tokenization_common import TokenizerTesterMixin, filter_roberta_detectors