[Python] Fix AB-BA deadlock between Python GIL and DescriptorPool mutex - #109
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Ensure all C++ locks (Program mutex, Activation mutex, once flags, DescriptorPool mutex) precede Python GIL acquisition by releasing the GIL in PyCelExpression::Eval, PyObjectToCelValue, and PyCelEnvInternal constructor, while acquiring the GIL on callbacks into Python. PiperOrigin-RevId: 989033642
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[Python] Fix AB-BA deadlock between Python GIL and DescriptorPool mutex
Ensure all C++ locks (Program mutex, Activation mutex, once flags,
DescriptorPool mutex) precede Python GIL acquisition by releasing the GIL
in PyCelExpression::Eval, PyObjectToCelValue, and PyCelEnvInternal
constructor, while acquiring the GIL on callbacks into Python.