GH-117714: implement athrow().close() and asend().close() using throw (GH-117906)

* GH-117714: replace athrow().close() and asend().close() stubs with implimentations

* test athrow().close() and asend().close() raises RuntimeError

* 📜🤖 Added by blurb_it.

* Update Objects/genobject.c

Co-authored-by: Petr Viktorin <encukou@gmail.com>

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Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>