[Quant] Add lowering for pixel_unshuffle/narrow (#96160)
Summary:
## Summary
torch.nn.functional.pixel_unshuffle and torch.narrow accepts both float
and quantized inputs. However, previously we would unnecessarily
dequantize quantized inputs into floats before passing them to
the function. This commit fixes this by lowering the pattern
[dequant - pixel_unshuffle - quant].
[dequant - narrow - quant].
Test Plan:
```
python test/test_quantization.py TestQuantizeFxOps.test_pixel_unshuffle
```
```
python test/test_quantization.py TestQuantizeFxOps.test_narrow
```
Differential Revision: D43858199
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96160
Approved by: https://github.com/andrewor14
