Implement bicubic grid sampler (#44780)
Summary:
Fix https://github.com/pytorch/pytorch/issues/44601
I added bicubic grid sampler in both cpu and cuda side, but haven't in AVX2
There is a [colab notebook](https://colab.research.google.com/drive/1mIh6TLLj5WWM_NcmKDRvY5Gltbb781oU?usp=sharing) show some test results. The notebook use bilinear for test, since I could only use distributed version of pytorch in it. You could just download it and modify the `mode_torch=bicubic` to show the results.
There are some duplicate code about getting and setting values, since the helper function used in bilinear at first clip the coordinate beyond boundary, and then get or set the value. However, in bicubic, there are more points should be consider. I could refactor that part after making sure the overall calculation are correct.
Thanks
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44780
Reviewed By: mrshenli
Differential Revision: D24681114
Pulled By: mruberry
fbshipit-source-id: d39c8715e2093a5a5906cb0ef040d62bde578567
