feat: add constants/float32/eulergamma

[Neerajpathak07]

Progresses #649.

Description

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This pull request:

• adds constants/float32/eulergamma

Related Issues

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This pull request:

• progresses [RFC]: Add C implementations to base special math functions (tracking issue) #649

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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/eulergamma	$\color{green}53/53$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}53/53$ $\color{green}+100.00\%$

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

[Neerajpathak07]

@kgryte At this point my Vs Code is just autocorrecting the var name to the existing package that we have for float32. But I have made the changes and disabled the feature locally.

[Neerajpathak07]

The double-precision version uses GAMMA wouldn't it be desired to change to EULERGAMMA

[kgryte]

The double-precision version uses GAMMA wouldn't it be desired to change to EULERGAMMA

Feel free to open a PR updating constants/float64/eulergamma to enforce consistency with EULERGAMMA.

[kgryte]

LGTM after clean-up.