Added support for quantizing TEGroupedMLP for megatron-lm

[kinjalpatel27]

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.77%. Comparing base (cb44c55) to head (22bfe0e).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
modelopt/torch/quantization/model_calib.py	75.00%	3 Missing ⚠️
modelopt/torch/utils/distributed.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
- Coverage   73.79%   73.77%   -0.03%     
==========================================
  Files         171      171              
  Lines       17591    17603      +12     
==========================================
+ Hits        12982    12986       +4     
- Misses       4609     4617       +8     

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[realAsma]

tensor parallel sync here is not handled correctly across various cases. See the comments before sync_quantizer_amax_across_tp for more details