feat: add C implementation for blas/ext/base/ndarray/snansumkbn2

[Siddhram]

Resolves None.

Description

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This pull request:

• Adds C implementation for stats/base/ndarray/snansumkbn2

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This pull request has the following related issues:

• #{{TODO: add related issue number}}

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[kgryte]

In your addon.c file, you need to pass a const-qualified list of arrays. See ebbf2de.

[Siddhram]

In your addon.c file, you need to pass a const-qualified list of arrays. See ebbf2de.

I've updated addon.c to use a const-qualified list of arrays, following the referenced implementation. Please take another look.