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Enable safetensors conversion from PyTorch to other frameworks without the torch requirement (#27599)

* Initial commit

* Requirements & tests

* Tests

* Tests

* Rogue import

* Rogue torch import

* Cleanup

* Apply suggestions from code review
Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

* bfloat16 management

* Sanchit's comments

* Import shield

* apply suggestions from code review

* correct bf16

* rebase

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Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>
Co-authored-by: sanchit-gandhi <sanchit@huggingface.co>

* Default to msgpack for safetensors

* Apply suggestions from code review
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

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Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* don't use `use_auth_token`internally

* let's use token everywhere

* fixup

* Safetensors serialization by default

* First pass on the tests

* Second pass on the tests

* Third pass on the tests

* Fix TF weight loading from TF-format safetensors

* Specific encoder-decoder fixes for weight crossloading

* Add VisionEncoderDecoder fixes for TF too

* Change filename test for pt-to-tf

* One missing fix for TFVisionEncoderDecoder

* Fix the other crossload test

* Support for flax + updated tests

* Apply suggestions from code review
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* Sanchit's comments

* Sanchit's comments 2

* Nico's comments

* Fix tests

* cleanup

* Apply suggestions from code review
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

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Co-authored-by: Matt <rocketknight1@gmail.com>
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>