add metadata format to save_file in FullModelHFCheckpointer

[man-shar]

AutoModel.xx classes from hf's transformers do not work otherwise, and we get an error because the metadata is None while loading the model here: https://github.com/huggingface/transformers/blob/main/src/transformers/modeling_utils.py#L518-L522

That said, I only have very basic knowledge of this so might be wrong here. I personally had to re-save the model files with metadata added for them to work with AutoModel... classes.

Context

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• [x ] add a new feature
• [x ] fix a bug (ish??)
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Changelog

Adds pt metadata while saving safetensors in FullModelHFCheckpointer.

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[pytorch-bot]

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[joecummings]

Hi @man-shar! Thanks for this super helpful PR - once you run the linting, we can get this merged.

pre-commit install and pre-commit run --all-files should work.

[man-shar]

thank you! just ran the linter and updated.