[quant][fx] Embedding quantization support (#46677)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46677
Add support for weight only embedding quantization
Test Plan:
python test/test_quantization.py TestQuantizeFxOps.test_qembedding_module
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D24463305
fbshipit-source-id: 2dba49d8a77cf237a8e6da2efdd83b1ebdc432d6
