[issue46008] Prepare runtime/interp/thread state and init for upcoming changes.

[Eric Snow]

Change by Eric Snow <ericsnowcurrently at gmail.com>:


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pull_requests: +28197
pull_request: https://github.com/python/cpython/pull/29972

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46008>
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