extract make_* functions out of make_*_loader #597

Job	Run time
onnx / linux-job	5m 32s
unittests-extended / linux-job	18m 20s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	27m 56s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	24m 52s
unittests-linux (3.8, linux.12xlarge, cpu) / linux-job	28m 3s
unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	22m 3s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	27m 29s
unittests-macos (3.10, macos-12) / macos-job	1h 11m 16s
unittests-macos (3.8, macos-m1-12) / macos-job	26m 56s
unittests-macos (3.11, macos-12) / macos-job	1h 10m 38s
unittests-macos (3.9, macos-12) / macos-job	1h 9m 7s
unittests-macos (3.8, macos-12) / macos-job	1h 46m 52s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	53m 59s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	44m 8s
unittests-windows (3.8, windows.4xlarge, cpu) / windows-job	59m 4s
unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	32m 53s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	56m 56s
	12h 26m 4s

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