[issue36710] Pass _PyRuntimeState as an argument rather than using the _PyRuntime global variable

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

Instead of passing `_PyRuntimeState` around everywhere, why not just let it disappear in time.

Currently `_PyRuntimeState` manages "global" state, mainly the GIL and some config.
Once the GIL has been migrated to the sub-interpreters, the config part can be factored out and `_PyRuntimeState` can just disappear.

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nosy: +Mark.Shannon

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<https://bugs.python.org/issue36710>
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