Add an option for private class attributes #373

Job	Run time
Test pre-commit console encoding	24s
Test Python 3.8 (ubuntu-latest)	1m 2s
Test Python 3.9 (ubuntu-latest)	1m 4s
Test Python 3.10 (ubuntu-latest)	1m 4s
Test Python 3.11 (ubuntu-latest)	51s
Test Python 3.12 (ubuntu-latest)	18s
Test Python 3.8 (windows-latest)	2m 10s
Test Python 3.9 (windows-latest)	2m 4s
Test Python 3.10 (windows-latest)	2m 15s
Test Python 3.11 (windows-latest)	2m 13s
Test Python 3.12 (windows-latest)	49s
Test Python 3.8 (macOS-latest)	1m 15s
Test Python 3.9 (macOS-latest)	46s
Test Python 3.10 (macOS-latest)	44s
Test Python 3.11 (macOS-latest)	48s
Test Python 3.12 (macOS-latest)	14s
	18m 1s

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