refactor Datapoint dispatch mechanism #833

Job	Run time
unittests-extended / linux-job	40s
onnx / linux-job	42s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	26m 48s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	23m 32s
unittests-linux (3.8, linux.12xlarge, cpu) / linux-job	26m 28s
unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	17m 22s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	25m 45s
unittests-macos (3.10, macos-12) / macos-job	1m 25s
unittests-macos (3.11, macos-12) / macos-job	2m 48s
unittests-macos (3.8, macos-12) / macos-job	1m 45s
unittests-macos (3.8, macos-m1-12) / macos-job	1m 12s
unittests-macos (3.9, macos-12) / macos-job	1m 45s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	2m 22s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	1m 44s
unittests-windows (3.8, windows.4xlarge, cpu) / windows-job	1m 33s
unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	25m 3s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	2m 59s
	2h 43m 53s

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