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

[headlessNode]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• Adds add C ndarray API and refactor blas/ext/base/zfill

Related Issues

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No.

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[headlessNode]

@kgryte I'll go ahead and apply the test changes in this PR.

[kgryte]

@headlessNode In the future, we will want to split "mixed" changes across multiple PRs. E.g., adding a new feature with making fixes to tests and documentation. Because of how we perform automatic changelog generation, we rely on commits which do not conflate multiple changes. E.g., if we add a new feature, that triggers a semver minor change in a package, but a doc or test change should only trigger a semver patch. However, if a commit has both new features and patch changes, packages may be inadvertently bumped higher than necessary.

[headlessNode]

@kgryte understood.

[kgryte]

This looks good. Just a final question.

[kgryte]

LGTM. Thanks, @headlessNode!

[headlessNode]

@kgryte Heads up. I am getting a failing test due to the change M=16, I am finding the reason/solution.