[quant] Add Quantized BatchNorm2d module (#33109)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/33109
Test Plan:
python test/test_quantized_nn_mods.py ModuleAPITest.test_batch_norm
Imported from OSS
Differential Revision: D19861926
fbshipit-source-id: 67315e49b4b3577b965d422ca707d927d977feeb
