[quantized] Add bilinear quantized grid_sample (#66879)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66879
This adds a quantized implementation for bilinear gridsample. Bicubic interpolation cannot be supported as easily since we rely on the linearity of quantization to operate on the raw values, i.e.
f(q(a), q(b)) = q(f(a, b)) where f is the linear interpolation function.
ghstack-source-id: 141321116
Test Plan: test_quantization
Reviewed By: kimishpatel
Differential Revision: D31656893
fbshipit-source-id: d0bc31da8ce93daf031a142decebf4a155943f0f
