MAINT: unify NPY_NO_SIGNAL macros

[ci skip]

This means moving ComplexWarning, TooHardError, and AxisError.

MAINT: Move set_module from numpy.core to numpy._utils

API: Add numpy.testing.overrides to aid testing of custom array containers

* DOC: Slightly improve error when gufunc axes has wrong size

My hope was to tweak it into something useful that:

    a @= b

can raise when `b` should have two dimensions and has two axes specified
but actually only has one.
I didn't succeed, but I still think it a slight improvement to give the
ufunc name and the actual core dimensions.

* ENH: Use AxisError when gufunc axes appear wrong due to the number of entries

This allows catching the error relatively targeted for in-place matmul `a @= b`
which may use this path.

* MAINT: Restore most TypeErrors (a bit more compexl than nice, but...)

* DOC: add a release note

Co-authored-by: mattip <matti.picus@gmail.com>

* make isnan, isinf, isfinite, signbit, nextafter aliases

* fixes from review

Co-authored-by: Sebastian Berg <sebastianb@nvidia.com>