Support model export for int4 wo

[meenchen]

What does this PR do?

Type of change:
Support model export for int4 weight only quantization

Overview: ?

Usage

# Add a code snippet demonstrating how to use this

Testing

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• Is this change backward compatible?: Yes/No
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Additional Information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.57%. Comparing base (3ef9e39) to head (dc523c4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #653   +/-   ##
=======================================
  Coverage   74.57%   74.57%           
=======================================
  Files         183      183           
  Lines       18451    18451           
=======================================
  Hits        13759    13759           
  Misses       4692     4692           

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