[quant] Add quantize and dequantize operators to decomposition table (#93312)
Summary:
This PR tries to decompose the operators in torch.ops.quantized_decomposed namespace to more
primitive aten operators, this would free us from maintaining the semantics of the quantize/dequantize
operators, which can be expressed more precises in terms of underlying aten operators
Note: this PR just adds them to the decomposition table, we haven't enable this by default yet
Test Plan:
python test/test_quantization.py TestQuantizePT2E.test_q_dq_decomposition
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/93312
Approved by: https://github.com/vkuzo, https://github.com/SherlockNoMad
