[quant][graphmode][fx] Add support for clamp (#43437)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43437
Porting op tests from test_quantize_jit.py
Test Plan:
TestQuantizeFxOps
Imported from OSS
Reviewed By: raghuramank100
Differential Revision: D23278584
fbshipit-source-id: 266dc68c9ca30d9160a1dacf28dc7781b3d472c2
