feat: add C implementation for stats/base/dists/chisquare/mean

[Neerajpathak07]

Resolves #3504 .

Description

What is the purpose of this pull request?

This pull request:

• adds C implementation for stats/base/dists/chisquare/mean

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: Add C implementation for @stdlib/stats/base/dists/chisquare/mean #3504

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/chisquare/mean	$\color{green}160/160$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}160/160$ $\color{green}+100.00\%$

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