[RFC]: refactor blas/ext/base/dsnannsumors to follow current project conventions

[Planeshifter]

Description

This RFC proposes refactoring @stdlib/blas/ext/base/dsnannsumors to follow current project conventions.

These conventions are outlined in more detail in #788. Namely, we want to migrate from C++ add-on interfaces to C add-on interfaces and then make various style and simplification changes.

Some example commits which perform most, if not all, of the requested changes include d66d80c (saxpy), 3c82fe7 (cswap), and 5b15c96 (dasum).

Related Issues

Related issues #788, #1152.

Questions

No.

Other

No.

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

[stdlib-bot]

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• If you are attempting to contribute a new package, sometimes the best approach is to simply copy the contents of an existing package and then modify the minimum amount necessary to implement the feature (e.g., changing descriptions, parameter names, and implementation).
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In short, the more effort you put in to ensure that your contribution looks and feels like stdlib—including variables names, bracket spacing, line breaks, etc—the more likely that your contribution will be reviewed and ultimately accepted. We encourage you to closely study the codebase before beginning work on this issue.

✨ Thank you again for your interest in stdlib, and we look forward to reviewing your future contriubtions. ✨

[VinayakPaka]

Can you please assign this issue? to me.

[kgryte]

@VinayakPaka Please read the message above.

[GittyHarsha]

Hi @Planeshifter and @kgryte,
I hope this issue is still relevant, hence I am contributing through PR #2804.

Thanks!