Add Bitnet model (#37742)

* Adding BitNet b1.58 Model

* Add testing code for BitNet

* Fix format issues

* Fix docstring format issues

* Fix docstring

* Fix docstring

* Fix: weight back to uint8

* Fix

* Fix format issues

* Remove copy comments

* Add model link to the docstring

* Fix: set tie_word_embeddings default to false

* Update

* Generate modeling file

* Change config name for automatically generating modeling file.

* Generate modeling file

* Fix class name

* Change testing branch

* Remove unused param

* Fix config docstring

* Add docstring for BitNetQuantConfig.

* Fix docstring

* Update docs/source/en/model_doc/bitnet.md

Co-authored-by: Mohamed Mekkouri <93391238+MekkCyber@users.noreply.github.com>

* Update docs/source/en/model_doc/bitnet.md

Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>

* Update bitnet config

* Update explanation between online and offline mode

* Remove space

* revert changes

* more revert

* spaces

* update

* fix-copies

* doc fix

* fix minor nits

* empty

* small nit

* empty

---------

Co-authored-by: Shuming Ma <shumingma@pku.edu.cn>
Co-authored-by: shumingma <shmingm@gmail.com>
Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>

docs/source/en/main_classes/quantization.md

@@ -77,9 +77,9 @@ Learn how to quantize models in the [Quantization](../quantization) guide.
 
 [[autodoc]] TorchAoConfig
 
-## BitNetConfig
+## BitNetQuantConfig
 
-[[autodoc]] BitNetConfig
+[[autodoc]] BitNetQuantConfig
 
 ## SpQRConfig