GitLab

* Implement JSON dump conversion for torch_dtype in TrainingArguments

* Add unit test for converting torch_dtype in TrainingArguments to JSON

* move unit test for converting torch_dtype into TrainerIntegrationTest class

* reformating using ruff

* convert dict_torch_dtype_to_str to private method _dict_torch_dtype_to_str

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Co-authored-by: jun.4 <jun.4@kakaobrain.com>