ENH: Add namedtuple return types to linalg functions that return tuples

Co-authored-by: Bas van Beek <43369155+BvB93@users.noreply.github.com>

MAINT: remove redundant open() modes and io.open() alias

[skip cirrus]

This assumes lapack errors already report something reasonable, that
may not be true, but is a different issue probably.

The finfo contains a cache for dtypes, but the np.complex128 dtype does not end up in the cache. The reason is that the np.complex128 is converted to np.float64 which is in the cache.

Performance improvement for finfo(np.complex128):

Main: 2.07 µs ± 75 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
Pr: 324 ns ± 28.9 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

Improve performance of finfo by making the cache check the first action in the __new__

Improve performance of _commonType by re-using the expression for a.dtype.type and eliminating variables
The finfo and _commonType was part of the computatation time in lstsq when using scikit-rf. Since these methods are used in various other methods performance can improve there slightly as well.

`std::is_scalar` is defined in `type_traits`, which is missing from the
includes.