feat: copy_behaviors to make sub-classing easy #2710

Job	Run time
Linux-cppyy	1m 48s
Linux-ROOT	5m 3s
Run Tests (windows-latest, 3.12, x64, full)	7m 24s
Run Tests (windows-latest, 3.11, x64, full)	6m 41s
Run Tests (windows-latest, 3.10, x64, full)	6m 26s
Run Tests (windows-latest, 3.9, x64, full)	6m 18s
Run Tests (windows-latest, 3.8, x64, full)	6m 41s
Run Tests (ubuntu-latest, 3.12, x64, full)	4m 28s
Run Tests (ubuntu-latest, 3.11, x64, full)	6m 21s
Run Tests (ubuntu-latest, 3.10, x64, full)	7m 27s
Run Tests (ubuntu-latest, 3.9, x64, full)	6m 30s
Run Tests (ubuntu-latest, 3.8, x64, full)	6m 25s
Run Tests (macos-11, 3.12, x64, full)	7m 19s
Run Tests (macos-11, 3.11, x64, full)	10m 28s
Run Tests (macos-11, 3.10, x64, full)	10m 27s
Run Tests (macos-11, 3.9, x64, full)	10m 32s
Run Tests (macos-11, 3.8, x64, full)	11m 45s
Run Tests (3.9, x86, windows-latest, full)	7m 45s
Run Tests (3.9, x86, windows-latest, numpy1)	9m 15s
Run Tests (3.8, x64, ubuntu-latest, minimal)	4m 3s
Run Tests (pypy3.9, x64, ubuntu-latest, pypy)	3m 48s
	2h 26m 54s

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