port tests for F.pad and transforms.Pad #1353

Job	Run time
unittests-extended / linux-job	36s
onnx / linux-job	40s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	1m 6s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	1m 0s
unittests-linux (3.8, linux.12xlarge, cpu) / linux-job	36s
unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	51s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	33s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	3m 28s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	3m 53s
unittests-windows (3.8, windows.4xlarge, cpu) / windows-job	3m 43s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	3m 27s
unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	45s
unittests-macos (3.11, macos-12) / macos-job	1m 50s
unittests-macos (3.10, macos-12) / macos-job	1m 43s
unittests-macos (3.8, macos-12) / macos-job	2m 0s
unittests-macos (3.8, macos-m1-12) / macos-job	1m 23s
unittests-macos (3.9, macos-12) / macos-job	7m 34s
	35m 8s

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