Add support to print QTensor in cpp (#22950)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22950
Print quantized tensor by first dequantizing it and then printing. Also print the scale, zero_point. size and type of tensor.
Reviewed By: jerryzh168
Differential Revision: D16286397
fbshipit-source-id: 2d6fb1796e5b329a77c022b18af0a39f6edde0d7
