gh-117657: Use PyMutex based recursive lock for import lock #118523
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This adds a `_PyRecursiveMutex` type based on `PyMutex` and uses that for the import lock. This fixes some data races in the free-threaded build and generally simplifies the import lock code.
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This adds a
_PyRecursiveMutextype based onPyMutexand uses that for the import lock. This fixes some data races in the free-threaded build and simplifies the import lock code.