feat: Implement `cross_validate` functionality #287

Job	Run time
changes	3s
lint-all-files / lint-all-files	25s
lint-and-test-skore-ui / lint-skore-ui	24s
lint-and-test-skore / build-skore-ui	1m 10s
lint-and-test-skore-ui / test-skore-ui	21s
lint-and-test-skore-ui / build-skore-ui	53s
lint-and-test-skore / test-skore (ubuntu-latest, 3.9)	1m 29s
lint-and-test-skore / test-skore (ubuntu-latest, 3.10)	1m 45s
lint-and-test-skore / test-skore (ubuntu-latest, 3.11)	1m 28s
lint-and-test-skore / test-skore (ubuntu-latest, 3.12)	2m 2s
lint-and-test-skore / test-skore (windows-latest, 3.9)	2m 42s
lint-and-test-skore / test-skore (windows-latest, 3.10)	2m 46s
lint-and-test-skore / test-skore (windows-latest, 3.11)	2m 45s
lint-and-test-skore / test-skore (windows-latest, 3.12)	2m 46s
lint-and-test-skore / cleanup	3s
ci-all-green	1s
	21m 3s

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