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

[headlessNode]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• Adds C ndarray API and refactor/cleanup blas/ext/base/dnansumors

Related Issues

Does this pull request have any related issues?

No.

Questions

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No.

Other

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Checklist

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• [x] Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[kgryte]

@headlessNode Do you know the reason for the lint failure on CI?

[headlessNode]

@kgryte I tried to find it in this PR but didn't find anything in the C files that could be causing this.

[Planeshifter]

@headlessNode @kgryte To me, it looks like the C lint failures are due to cppcheck installation failing. Could have to do with latest GitHub Actions runner upgrade. Failures are not due to changes in this PR and are occurring in other PRs as well. We may need to look into the compilation failures. Upgrading cppcheck to a newer version could also be explored.

[kgryte]

@Planeshifter Upgrading cppcheck seems to have caused other build failures when linting C files. The failing build does not appear to be due to changes in this PR. As such, I will go ahead and merge.