[`Mxfp4`] Add a way to save with a quantization method (#40176)
* add a test
* tempdir
* fix import issue[
* wow I am tired
* properly init
* i am not super familiar with quantizer api :|
* set to TRUE fro now
* full support
* push current changes
* will clean this later but the imports are a shitshow here
* this correctly saves the block and scales but forward seems broken
* quanitze was not correct
* fix storage
* why were bias even included
* finally!
* style
* fix style
* remove print
* lazy import
* up
* not sure what happens this works now?
* holy molly it was not so far
* okay this seems to work!
* workings!!!
* allow save_pretrained to create PR
* Apply suggestions from code review
* fixup
* add deqyabtze fakse as wek
* working new
* fix
* rm swizzle and unswizzle during saving
* rm print
* Update src/transformers/modeling_utils.py
* fix
* style
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Co-authored-by: Marc Sun <marc@huggingface.co>