Add import linter contract #672

Job	Run time
benchmarks	6m 21s
Check Python 3.9, ubuntu-latest	1m 29s
Check Rust	1m 4s
Check Python 3.10, windows-latest	2m 47s
Check Python 3.9, windows-latest	2m 57s
Check Python 3.11, ubuntu-latest	1m 22s
Check Python 3.11, macos-latest	2m 7s
Check Python 3.9, macos-latest	1m 51s
Check Python 3.11, windows-latest	3m 16s
Check Python 3.13-dev, macos-latest	2m 7s
Check Python 3.12, ubuntu-latest	1m 26s
Check Python 3.13-dev, ubuntu-latest	2m 20s
Check Python 3.13-dev, windows-latest	4m 29s
Check Python 3.12, macos-latest	1m 9s
Check Python 3.10, ubuntu-latest	1m 24s
Check Python 3.12, windows-latest	4m 40s
Check Python 3.10, macos-latest	2m 13s
	43m 2s

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