[quant][pt2e] Add reference representation for dynamic quantized linear (#108073)
Summary: att
Test Plan:
python test/test_quantization.py TestQuantizePT2E.test_representation_dynamic_linear
buck2 test 'fbcode//mode/opt' fbcode//caffe2/test:quantization_pt2e -- 'test_representation_dynamic_linear'
Reviewed By: kimishpatel
Differential Revision: D48703076
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108073
Approved by: https://github.com/andrewor14
