[quant] Implement APoT fake quantization (#79845)
### Summary:
This PR implements APoT fake quantization for the purpose of quantization aware training. This implements `calculate_qparams` and `forward `methods to be used in fake quantization.
### Test Plan:
Run unit tests with: `python pytorch/test/quantization/core/experimental/test_fake_quantize.py`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79845
Approved by: https://github.com/dzdang
