Support sharded safetensors in TF (#29350)
* Initial commit (still lots of unfinished bits)
* (Still untested) add safetensors sharding to save_pretrained
* Fix savetensors saving, update default shard size to match PT
* Add proper loading of TF-format safetensors
* Revert default size in case that changes things
* Fix incorrect index name
* Update loading priority
* Update tests
* Make the tests a little more stringent
* Expand tests
* Add sharded cross-test
* Fix argument name
* One more test fix
* Adding mlx to the list of allowed formats
* Remove irrelevant block for safetensors
* Refactor warning logging into a separate function
* Remove unused skip_logger_warnings arg
* Update src/transformers/modeling_tf_utils.py
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
* Move function def
---------
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
