[quant][graphmode][fx] Add support for instance_norm (#43377)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43377
Porting op tests from test_quantize_jit.py
Test Plan:
TestQuantizeFxOps
Imported from OSS
Reviewed By: z-a-f
Differential Revision: D23257045
fbshipit-source-id: 7f4ad5d81f21bf0b8b9d960b054b20dc889e6c3b
