Add `lowest_common_ancestor` algorithm (#35) #240

Job	Run time
changed-files / Check changed files	7s
devcontainer / amd64, 12.8, conda	4m 1s
checks / check-style	2m 11s
devcontainer / amd64, 12.8, pip	5m 17s
checks / other-checks	35s
wheel-build-nx-cugraph	0s
conda-python-build	0s
wheel-tests-nx-cugraph	0s
conda-python-tests	0s
pr-builder / run	1s
	12m 12s

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