FIX / Quantization: Add extra validation for bnb config #31135
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What does this PR do?
Fixes: #31124
Adds extra validation for bnb config, the guard
getattr(torch, bnb_4bit_quant_storage)is not sufficient since torch can contain some attributes such asadd, which makesgetattr(torch "add")pass without any errorcc @SunMarc @amyeroberts