Add mypy static type checking to pydoclint #445

Job	Run time
Test pre-commit console encoding	25s
Test Python 3.8 (ubuntu-latest)	1m 9s
Test Python 3.9 (ubuntu-latest)	1m 8s
Test Python 3.10 (ubuntu-latest)	1m 7s
Test Python 3.11 (ubuntu-latest)	1m 2s
Test Python 3.12 (ubuntu-latest)	18s
Test Python 3.8 (windows-latest)	2m 53s
Test Python 3.9 (windows-latest)	2m 29s
Test Python 3.10 (windows-latest)	2m 54s
Test Python 3.11 (windows-latest)	2m 44s
Test Python 3.12 (windows-latest)	42s
Test Python 3.8 (macOS-latest)	1m 25s
Test Python 3.9 (macOS-latest)	1m 8s
Test Python 3.10 (macOS-latest)	1m 14s
Test Python 3.11 (macOS-latest)	52s
Test Python 3.12 (macOS-latest)	13s
	21m 43s

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