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[GR-79953] Optimize vectorcall dispatch. - #1200
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This change improves GraalPy’s vectorcall support for native types, with Cython-generated extension code being the primary beneficiary.
It allows more calls involving native callables and method descriptors to remain on the vectorcall path, avoiding unnecessary argument adaptation and transitions between native and managed.
It also enables Cython’s fast calling conventions and improves method-call dispatch so Cython-to-Cython calls can stay in native code more often.
The optimized behavior is not Cython-specific: other native extensions using vectorcall, native method descriptors, or native
tp_callimplementations benefit from the same lower-overhead dispatch paths.