Add support for classes #91

Job	Run time
validate-matrix-linux (ubuntu-22.04, 3.11)	13s
validate-matrix-windows (windows-2019, 3.11)	55s
validate-matrix-linux (ubuntu-22.04, 3.12)	11s
validate-matrix-macos (macos-13, 3.11)	17s
validate-matrix-windows (windows-2019, 3.12)	31s
validate-matrix-linux (ubuntu-24.04, 3.11)	11s
validate-matrix-macos (macos-13, 3.12)	18s
validate-matrix-windows (windows-2022, 3.11)	36s
validate-matrix-linux (ubuntu-24.04, 3.12)	29s
validate-matrix-macos (macos-14, 3.11)	11s
validate-matrix-windows (windows-2022, 3.12)	29s
validate-matrix-macos (macos-14, 3.12)	10s
validate-matrix-macos (macos-15, 3.11)	22s
validate-matrix-macos (macos-15, 3.12)	9s
	5m 2s

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