config file based modelopt config 1/N

[shengliangxu]

What does this PR do?

Type of change: ?

new feature

Overview: ?

1. start a new config system using yaml/yml files. The config system adopts Hydra style override, using the defaults tag, but we implement it by ourselves by simply merging the configs using OmegaConf

2. implement the quantization configs using the new config system, but not actually in use.

3. make sure the configs from the new config system match the exisiting configs

4. pipe through config_file based hf_ptq script

5. testted hf_ptq using both builtin and extenal config file

Testing

python examples/llm_ptq/hf_ptq.py \
    --pyt_ckpt_path=Qwen/Qwen3-8B \
    --export_path=qwen3-8B_fp8 \
    --qformat=fp8 \
    --kv_cache_qformat=fp8 \
    --calib_size=16 \
    --batch_size=0 \
    --trust_remote_code \
    --export_fmt=hf

python examples/llm_ptq/hf_ptq.py \
    --pyt_ckpt_path=Qwen/Qwen3-8B \
    --export_path=nvfp4_awq \
    --qformat=nvfp4_awq_full \
    --kv_cache_qformat=fp8 \
    --calib_size=16 \
    --batch_size=0 \
    --trust_remote_code \
    --export_fmt=hf

python examples/llm_ptq/hf_ptq.py \
    --qformat=nvfp4,fp8 \
    --auto_quantize_score_size 128 \
    --auto_quantize_bits 5.0 \
    --auto_quantize_checkpoint Qwen3-8B-auto-quantize-checkpoint \
    --pyt_ckpt_path=Qwen/Qwen3-8B \
    --export_path=qwen3-8B_auto_quantize \
    --kv_cache_qformat=fp8 \
    --calib_size=16 \
    --batch_size=0 \
    --trust_remote_code \
    --export_fmt=trtllm

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[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.52%. Comparing base (9409412) to head (c5f657e).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
modelopt/torch/opt/config.py	31.57%	13 Missing ⚠️
modelopt/torch/quantization/config.py	93.87%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #657      +/-   ##
==========================================
- Coverage   74.66%   74.52%   -0.15%     
==========================================
  Files         183      183              
  Lines       18550    18467      -83     
==========================================
- Hits        13851    13763      -88     
- Misses       4699     4704       +5     

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