ENH: Add slots to NDArrayOperatorsMixin to make subclsasing smoother

I use the mixings in a few different file backed arrays.

However, the lack of slots make it difficult for me to use slots.

I mostly use slots to ensure that performance optimized code doesn't
create unecessary references to large chunks of memory.

If all parent classes do not have `__slots__` defined, I think that Python
(3.9) just ignores `__slots__` alltogether.

Thank you for considering.

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