ENH: Improve the np.ufunc annotations
#19052
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This PR improves the
np.ufuncannotations.Among others this includes support for:
nin- andnout-based parameters, return-types and methods (at,reduce, etc.)__name__,signature, etc.)Aforementioned enhancements were achieved via the creation of private
nin-/nout-specific type-check-only subclasses,the latter providing much-needed additional flexibility over the singular ufunc class available at runtime.