Build and test linkml-runtime

BF: Fix bug and other improvement in `SchemaBuilder.add_class()` #722

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Run time

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Job	Run time
test (ubuntu-latest, 3.8)	53s
test (ubuntu-latest, 3.9)	53s
test (ubuntu-latest, 3.10)	1m 6s
test (ubuntu-latest, 3.12)	1m 7s
test (windows-latest, 3.9)	1m 31s
test (windows-latest, 3.10)	1m 43s
test (windows-latest, 3.12)	2m 13s
	9m 26s