gh-125018: Add importlib.metadata semantic link targets (#125027)

This allows direct intersphinx references to APIs via references
like `` :func:`importlib.metadata.version` ``.

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Co-authored-by: Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>