feat: add C ndarray API and refactor blas/ext/base/dsort2ins

[headlessNode]

Description

What is the purpose of this pull request?

This pull request:

• add C ndarray API and refactor blas/ext/base/dsort2ins

Related Issues

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No.

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• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dsort2ins	$\color{green}526/526$ $\color{green}+100.00\%$	$\color{green}41/41$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}526/526$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[headlessNode]

The C benchmark passes on local machine. The failure here is due to a time-out.