Remove old subclass implementation to reduce maintainence cost #2056
Description
After #2053 is done, we can remove the old subclass implementation: https://github.com/pytorch/ao/blob/main/torchao/quantization/subclass.py
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After #2053 is done, we can remove the old subclass implementation: https://github.com/pytorch/ao/blob/main/torchao/quantization/subclass.py