feat: add C implementation for stats/base/dists/t/variance

[AadishJ]

Resolves #3881 .

Description

What is the purpose of this pull request?

This pull request:

• Adds a C implementation of the t variance.
• Includes benchmarks for the C implementation.
• Provides examples demonstrating the usage of the t variance in C.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: Add C implementation for @stdlib/stats/base/dists/t/variance #3881

Questions

Any questions for reviewers of this pull request?

No.

Other

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

No.

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

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/t/variance	$\color{green}169/169$ $\color{green}+100.00\%$	$\color{green}10/10$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}169/169$ $\color{green}+100.00\%$

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

[MeastroZI]

@AadishJ You have to follow the coding style rules according to the project , please do the same for all files and all your's open PRs , you can refer other package files which have c implementations like stats/base/dists/arcsine/cdf
Cheers !

[AadishJ]

@MeastroZI I have made those changes, please check 😊