[quant][embdding qat] Re-land Add FX support for QAT EmbeddingBag (#69334)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69334
Original PR #68121 broke with incompatible qengine for Mac OS, this PR re-introduces changes with fix
Add FX support for QAT EmbeddingBag operator, previously only eager mode support.
Test Plan:
pytest test/quantization/fx/test_quantize_fx.py -v -k "test_qat_embeddingbag_linear"
Imported from OSS
Reviewed By: jingsh
Differential Revision: D32815153
fbshipit-source-id: 33654ce29de6e81920bf3277a75027fe403a1eb2
