Add mypy static type checking to pydoclint #444

Job	Run time
Test pre-commit console encoding	40s
Test Python 3.8 (ubuntu-latest)	1m 8s
Test Python 3.9 (ubuntu-latest)	1m 7s
Test Python 3.10 (ubuntu-latest)	1m 15s
Test Python 3.11 (ubuntu-latest)	1m 3s
Test Python 3.12 (ubuntu-latest)	18s
Test Python 3.8 (windows-latest)	3m 5s
Test Python 3.9 (windows-latest)	2m 46s
Test Python 3.10 (windows-latest)	2m 51s
Test Python 3.11 (windows-latest)	3m 12s
Test Python 3.12 (windows-latest)	1m 1s
Test Python 3.8 (macOS-latest)	1m 34s
Test Python 3.9 (macOS-latest)	1m 21s
Test Python 3.10 (macOS-latest)	1m 9s
Test Python 3.11 (macOS-latest)	53s
Test Python 3.12 (macOS-latest)	16s
	23m 39s

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