Add more useful benchmark for find_shortest_chains #687

Job	Run time
Check Rust	1m 7s
benchmarks	6m 36s
Check Python 3.9, ubuntu-latest	1m 21s
Check Python 3.9, macos-latest	1m 38s
Check Python 3.10, ubuntu-latest	1m 36s
Check Python 3.11, macos-latest	1m 10s
Check Python 3.12, windows-latest	3m 9s
Check Python 3.11, windows-latest	2m 55s
Check Python 3.9, windows-latest	4m 16s
Check Python 3.10, windows-latest	3m 3s
Check Python 3.13-dev, ubuntu-latest	2m 14s
Check Python 3.12, macos-latest	1m 24s
Check Python 3.10, macos-latest	1m 26s
Check Python 3.12, ubuntu-latest	1m 20s
Check Python 3.13-dev, windows-latest	4m 24s
Check Python 3.13-dev, macos-latest	1m 48s
Check Python 3.11, ubuntu-latest	1m 36s
	41m 3s

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