[Bugfix] ModuleNotFoundError when importing one_shot fromobcq

[rahul-tuli]

Python build command ignores packaging sparseml.transformers.sparsification.obcq in wheel due to missing init files in transformers/obcq folder. That causes a ModuleNotFoundError; this bug oly reveals itself when installing from the wheel, and actually passes when doing an --editable install

Fix includes: Adding missing init file in the respective folder

Steps to reproduce:

pip3 install --default-timeout=200 --index-url http://10.10.60.107:8080/ --trusted-host 10.10.60.107 "sparseml-nightly[torchvision, transformers]"

>>> from sparseml.transformers.sparsification.obcq.obcq import one_shot
/home/domenic/testing/testfail-1019/venv/lib/python3.10/site-packages/torch/cuda/__init__.py:546: UserWarning: Can't initialize NVML
  warnings.warn("Can't initialize NVML")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'sparseml.transformers.sparsification.obcq'
>>>

Adding init file fixes the issue; tested manually with building a wheel off of this Branch, and trying the same import again:

python3 -m pip install --upgrade build && python3 -m build && \
pip install "dist/sparseml_nightly-1.6.0.20231109-py3-none-any.whl[transformers, torchvision]" 

>>> import  sparseml.transformers.sparsification.obcq
>>> from sparseml.transformers.sparsification.obcq.obcq import one_shot
>>> 
KeyboardInterrupt