GaussianBlur CV-CUDA Backend

[justincdavis]

Summary

Implement the CV-CUDA backend kernel for gaussian_blur

How to use

import cvcuda
import torchvision.transforms.v2.functional as F

cv_tensor = cvcuda.Tensor((1, 224, 224, 3), cvcuda.Type.U8, cvcuda.TensorLayout.NHWC)
# dispatched to F.gaussian_blur_cvcuda
blurred = F.gaussian_blur(cv_tensor, (5, 5))

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9280

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As of commit 754223f8822454aff1339f571fa3128e869dc5d7 with merge base aa35ca1965bea39b9a0996d5d2d7f15d325e54d2 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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