bpo-1635741: Port _thread to multiphase init (GH-23811)

Port the _thread extension module to the multiphase initialization API (PEP 489) and convert its static types to heap types. Add a traverse function to the lock type, so the garbage collector can break reference cycles.
python · Mar 11, 2021 · f091303 · f091303
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diff --git a/Misc/NEWS.d/next/Library/2020-12-16-23-28-52.bpo-1635741.Quy3zn.rst b/Misc/NEWS.d/next/Library/2020-12-16-23-28-52.bpo-1635741.Quy3zn.rst
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+Port the :mod:`_thread` extension module to the multiphase initialization
+API (:pep:`489`) and convert its static types to heap types.