MAINT cleanup utils.__init__: move safe_sqr and _approximate_mode into extmath #28481
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extracted from #26686 to ease the reviews. The end goal is to clean the
utils.__init__.py
module as explained in the linked PR.safe_sqr
is listed inclasses.rst
so we can't assume it's private and I kept it importable fromutils
to not break existing code._approximate_mode
is private so is now only available fromutils.extmath
.