feat: add C `ndarray` API and refactor `blas/ext/base/dapxsumkbn2`

[headlessNode]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• Adds C ndarray API and code refactor/cleanup to blas/ext/base/dapxsumkbn2

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No.

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@stdlib-js/reviewers

[headlessNode]

@kgryte what could be causing these failed checks? On my local machine, the compilation is working fine.

[kgryte]

@headlessNode You haven't added the abs dep to the other configurations. abs is necessary to compile the source in all contexts, in this case.