[PyTorch Edge] Add Quantized Matmul Op (Naive Implementation) (#71783)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71783
Adds Quantized Matmul op which just naively performs dequantize -> matmul -> quantize. (To be optimized in the future)
Test Plan:
From fbcode:
```buck test caffe2/test:quantization -- test_qmatmul```
Reviewed By: kimishpatel
Differential Revision: D33443161
fbshipit-source-id: 7e0a8e45bed1a63f9cd68a70cadbc9a8e35b2faa
(cherry picked from commit 100d8b38c17eb398ed0e3cfa1f5db5b5068ae286)
