Optimize creation of isolating subnetworks using VdfIsolatedSubnetwork. #60

Job	Run time
macOS (3.8, python3.8, cp38)	30m 30s
macOS (3.11, python3.11, cp311)	56m 19s
macOS (3.10, python3.10, cp310)	28m 43s
Linux (cp311, /opt/python/cp311-cp311/bin/python, 3.11)	28m 55s
Linux (cp39, /opt/python/cp39-cp39/bin/python, 3.9)	29m 30s
Linux (cp310, /opt/python/cp310-cp310/bin/python, 3.10)	29m 14s
Windows (3.9, cp39)	33m 59s
macOS (3.12, python3.12, cp312)	27m 51s
macOS (3.9, python3.9, cp39)	29m 49s
Windows (3.10, cp310)	35m 53s
Windows (3.8, cp38)	34m 31s
Windows (3.12, cp312)	33m 51s
Windows (3.11, cp311)	33m 58s
Linux (cp312, /opt/python/cp312-cp312/bin/python, 3.12)	30m 20s
Linux (cp38, /opt/python/cp38-cp38/bin/python, 3.8)	28m 49s
CollectPackages	25s
Test (Linux_Python38, 3.8, ubuntu-22.04, python3)	25s
Test (Linux_Python39, 3.9, ubuntu-22.04, python3)	24s
Test (Mac_Python312, 3.12, macos-15, python3)	22s
Test (Mac_Python310, 3.10, macos-15, python3)	36s
Test (Mac_Python39, 3.9, macos-15, python3)	34s
Test (Mac_Python38, 3.8, macos-15, python3)	59s
Test (Linux_Python312, 3.12, ubuntu-22.04, python3)	24s
Test (Linux_Python310, 3.10, ubuntu-22.04, python3)	50s
Test (Linux_Python311, 3.11, ubuntu-22.04, python3)	26s
Test (Windows_Python39, 3.9, windows-2019, python3)	1m 16s
Test (Windows_Python38, 3.8, windows-2019, python3)	1m 24s
Test (Mac_Python311, 3.11, macos-15, python3)	22s
Test (Windows_Python311, 3.11, windows-2019, python3)	1m 27s
Test (Windows_Python312, 3.12, windows-2019, python3)	1m 44s
Test (Windows_Python310, 3.10, windows-2019, python3)	1m 15s
	8h 25m 5s

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