[eigen] Numerically stable tensor sum in eigen

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Hello all,

I am looking forward to implementing a numerically stable summation
(Kahan summation,
https://en.wikipedia.org/wiki/Kahan_summation_algorithm) method in

For now, I have gone through a little bit of the code and what I have
figured out is that I will need to create a stateful functor along the
lines of `MeanReducer`.

Posting here to get views/feedback of other contributors and
developers. Also, since this would be my first contribution to eigen,
any guidance/advice will be extremely helpful.


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