[RFC]: add `math/base/special/fmod`

[gunjjoshi]

Description

This RFC proposes adding math/base/special/fmod, which would follow this reference implementation: https://github.com/JuliaMath/openlibm/blob/master/src/e_fmod.c

This would enable us to have a function that works the same way as the modulus operator in javascript does.

Related Issues

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Questions

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Other

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Checklist

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

[stdlib-bot]

:wave: Hi there! :wave:

And thank you for opening your first issue! We will get back to you shortly. :runner: :dash:

[kgryte]

Thanks, @gunjjoshi! This sounds good and would be a good addition.