feat: add constants/float32/gamma-lanczos-g

[Neerajpathak07]

Progresses #649,
Resolves #6097.

Description

What is the purpose of this pull request?

This pull request:

• adds constants/float32/gamma-lanczos-g

Related Issues

Does this pull request have any related issues?

This pull request:

• progresses [RFC]: Add C implementations to base special math functions (tracking issue) #649
• resolves [RFC]: add constants/float32/gamma-lanczos-g #6097

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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
constants/float32/gamma-lanczos-g	$\color{green}52/52$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}52/52$ $\color{green}+100.00\%$

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

[Neerajpathak07]

/stdlib update-copyright-years

[Neerajpathak07]

cc:- @kgryte Will be needing this to implement gamma-lanczos-sumf

[kgryte]

LGTM. However, the actual value of g in single-precision functions may not exactly correspond to the double-precision implementation. As such, this constant may need to be revisited. Previously, we first implemented the approximations and once implemented backed out the constants and common utilities. Creating the constant first puts this in reverse, which may not be warranted.

[Neerajpathak07]

@kgryte Oh I see I'll look into it again as well.