ENH: Port numpy._core._simd to the Limited API - #32244
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Replace the constructs that are not part of the Limited API: the static PyTypeObject and its PySequenceMethods become a PyType_Spec heap type, PyObject_New() becomes PyType_GenericAlloc(), and the fast sequence, tuple and list accessors become their checked equivalents. Add the libc includes that Python.h stops providing at Py_LIMITED_API >= 3.11. Nearly all of the module's Python-facing code is compiled into the _simd_mtargets archive, which the `limited_api:` kwarg does not reach, so add py_limited_api_args and pass it there.
python.allow_limited_api defaults to false, so this is a no-op for shipped wheels.
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PR summary
Related to: #31913
I will update this soon with benchmarks. For now I will look how CI reacts, locally all the tests are passing for python
3.13linux build with limted api flag on.AI Disclosure
In researching and brainstorming specially the meson build part and for writing comments.