Add option to real quantize the model

[ajrasane]

What does this PR do?

Type of change:
Example update

Overview:

• Added flag to real quantize the weights
• mtq.compress() is only supported for FP8 and NVFP4

Usage

python quantize.py \
    --model flux-dev --model-dtype BFloat16 --trt-high-precision-dtype BFloat16 \
    --format fp8 --batch-size 1 --calib-size 32 --quantize-mha \
    --n-steps 20 --quantized-torch-ckpt-save-path ./flux_dev_fp8_autodeploy.pt --collect-method default \
    --compress

Before your PR is "Ready for review"

• Make sure you read and follow Contributor guidelines and your commits are signed.
• Is this change backward compatible?: Yes
• Did you write any new necessary tests?: No
• Did you add or update any necessary documentation?: No
• Did you update Changelog?: No

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.38%. Comparing base (41de55f) to head (aeab1d0).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #473   +/-   ##
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  Coverage   73.38%   73.38%           
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  Files         180      180           
  Lines       18110    18110           
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  Hits        13290    13290           
  Misses       4820     4820           

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