mypy

gh-110937: Document full public importlib.metadata.Distribution API (… #19665

Job	Run time
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/tomllib	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/jit	20s
Run mypy on Tools/clinic	19s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Tools/build	18s
	2m 48s

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