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

[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/dnannsumors

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

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@stdlib-js/reviewers

[headlessNode]

@kgryte same CI failure after merge. It was not present before.

[stdlib-bot]

PR Commit Message

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

PR-URL: https://github.com/stdlib-js/stdlib/pull/2991

Reviewed-by: Philipp Burckhardt <[email protected]>

Please review the above commit message and make any necessary adjustments.