Add support for classes #94

Job	Run time
validate-matrix-linux (ubuntu-22.04, 3.11)	15s
validate-matrix-windows (windows-2019, 3.11)	39s
validate-matrix-linux (ubuntu-22.04, 3.12)	12s
validate-matrix-macos (macos-13, 3.11)	17s
validate-matrix-windows (windows-2019, 3.12)	34s
validate-matrix-linux (ubuntu-24.04, 3.11)	14s
validate-matrix-macos (macos-13, 3.12)	30s
validate-matrix-windows (windows-2022, 3.11)	24s
validate-matrix-linux (ubuntu-24.04, 3.12)	10s
validate-matrix-macos (macos-14, 3.11)	11s
validate-matrix-windows (windows-2022, 3.12)	28s
validate-matrix-macos (macos-14, 3.12)	10s
validate-matrix-macos (macos-15, 3.11)	10s
validate-matrix-macos (macos-15, 3.12)	9s
	4m 23s

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