[quant][graph] Support for quantized::mul and quantized::mul_scalar (#36818)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/36818
Test Plan:
python test_quantize_script.py test_quantized_mul
python test_quantize_script.py test_quantized_mul_scalar
Imported from OSS
Differential Revision: D21134438
fbshipit-source-id: 9ed5e852c5c0c6899a11e3ed36e12b5045608ea4