feat: add math/base/special/fmod

[gunjjoshi]

Resolves #2405.

Description

What is the purpose of this pull request?

This pull request:

• adds math/base/special/fmod.

double stdlib_base_fmod( const double x, const double y );

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add math/base/special/fmod #2405.

Questions

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No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

• I have implemented this in C, and have used % in javascript, as it shows similar behaviour. Do we need to implement fmod in javascript too?
• Code coverage report:

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Planeshifter]

C code tracks the reference implementation and I am not seeing any issues. Will merge shortly.

I have implemented this in C, and have used % in javascript, as it shows similar behaviour. Do we need to implement fmod in javascript too?

As discussed, I believe we are fine in defaulting to the native functionality in JS.