Deprecate modeling_utils.py classes (#37298)

* Move utils classes into models

* Add deprecation warnings

* Remove from docs

* Update config attributes check

docs/source/ko/internal/modeling_utils.md

@@ -25,23 +25,6 @@ rendered properly in your Markdown viewer.
 
 [[autodoc]] pytorch_utils.Conv1D
 
-[[autodoc]] modeling_utils.PoolerStartLogits
-   - forward
-
-[[autodoc]] modeling_utils.PoolerEndLogits
-   - forward
-
-[[autodoc]] modeling_utils.PoolerAnswerClass
-   - forward
-
-[[autodoc]] modeling_utils.SquadHeadOutput
-
-[[autodoc]] modeling_utils.SQuADHead
-   - forward
-
-[[autodoc]] modeling_utils.SequenceSummary
-   - forward
-
 ## PyTorch 헬퍼(helper) 함수 [[transformers.apply_chunking_to_forward]]
 
 [[autodoc]] pytorch_utils.apply_chunking_to_forward