ToDtype CV-CUDA Backend

[justincdavis]

Summary

Add the backend kernel for ToDtype transform using CV-CUDA

How to use

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

cvc_tensor = cvcuda.Tensor((1, 224, 224, 3), cvcuda.Type.U8, cvcuda.TensorLayout.NHWC)
# Dispatches to F.to_dtype_cvcuda
cvc_fp32_tensor = F.to_dtype(cvc_tensor, torch.float32)

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9278

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[AntoineSimoulin]

@justincdavis could you complete the missing Contributor License Agreement (c.f. earlier comment from the meta-cla bot)?

[justincdavis]

Hi @zy1git thanks for the first pass! I have updated this PR to reflect the conventions of the flip PR, LMK what you think!