feat: add math/base/special/floornf

[gururaj1512]

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Resolves a part of #649 .

Description

What is the purpose of this pull request?

This pull request:

• Adds javascript and C implementation for math/base/special/floornf

Related Issues

Does this pull request have any related issues?

This pull request:

• Resolves a part of [RFC]: Add C implementations to base special math functions (tracking issue) #649 .

Other

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

• Implementation ideally should use powf. Due to unavailablity used inbuilt function of powf from <math.h>.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[gururaj1512]

/stdlib help

[gururaj1512]

/stdlib merge

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/floornf	$\color{red}272/274$ $\color{green}+99.27\%$	$\color{red}22/23$ $\color{green}+95.65\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{red}272/274$ $\color{green}+99.27\%$

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

[kgryte]

/stdlib merge

[kgryte]

@anandkaranubc Would you mind reviewing this PR and helping get it over the finish line? Cheers!