Multithreaded import scanning #682

Job	Run time
Check Rust	1m 12s
benchmarks	7m 10s
Check Python 3.9, ubuntu-latest	1m 29s
Check Python 3.9, macos-latest	1m 24s
Check Python 3.9, windows-latest	3m 4s
Check Python 3.11, macos-latest	1m 25s
Check Python 3.10, windows-latest	2m 52s
Check Python 3.11, ubuntu-latest	1m 28s
Check Python 3.12, ubuntu-latest	1m 18s
Check Python 3.12, windows-latest	3m 37s
Check Python 3.13-dev, windows-latest	4m 43s
Check Python 3.12, macos-latest	1m 24s
Check Python 3.13-dev, macos-latest	2m 43s
Check Python 3.13-dev, ubuntu-latest	2m 29s
Check Python 3.10, ubuntu-latest	1m 25s
Check Python 3.11, windows-latest	3m 0s
Check Python 3.10, macos-latest	1m 22s
	42m 5s

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