[quant] Add a e2e test for standalone module + custom backend_config_dict (#70152)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70152
This is to demonstrate our backend_config_dict works for one of
our internal use cases
Test Plan:
python test/fx2trt/test_quant_trt.py
Imported from OSS
Reviewed By: vkuzo, raghuramank100
Differential Revision: D33205161
fbshipit-source-id: dca8570816baaf85a79f2be75378d46c3af0e454
