[fx2trt] Add quantize_per_tensor support (#63447)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63447
Only available in TRT 8.0 and above
Test Plan: buck run mode/opt caffe2/torch/fb/fx2trt:test_quantize_per_tensor
Reviewed By: 842974287
Differential Revision: D30322844
fbshipit-source-id: dfd925e3432de128f2925b1aa55d6125e63359af