[quant][core][improvement][feature] Enabled support for quantized fill of nhwc tensors
Summary:
Previously, filling a quantized tensor only worked for nchw tensors.
This PR enables support for nhwc tensors. Test cases were added for per
tensor and per channel quantized NHWC tensors.
Test Plan:
```
python test/test_quantization.py -k test_qtensor_fill_per_channel_nhwc
python test/test_quantization.py -k test_qtensor_fill_per_tensor_nhwc
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79025
Approved by: https://github.com/jerryzh168
