Tests

Variable length columns for CTable #3402

Job	Run time
Build and test on ubuntu-latest (python 3.12)	10m 40s
Build and test on ubuntu-latest (python 3.14)	10m 41s
Build and test on macos-latest (python 3.12)	10m 14s
Build and test on windows-latest (python 3.12)	22m 10s
Build and test on ubuntu-latest (numpy 1.26)	10m 39s
	1h 4m 24s

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