CMake

Mentioning the padding policy in transforms.GaussianBlur docs #2150

Job	Run time
linux (linux.12xlarge, cpu) / linux-job	37s
linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	42s
macos (macos-12) / macos-job	1m 39s
macos (macos-m1-stable) / macos-job	1m 1s
windows (windows.4xlarge, cpu) / windows-job	2m 37s
windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	1m 3s
	7m 39s

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