feat: implementation of stats/base/dists/halfnormal/mgf

[shubham220420]

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Progresses: #9416

Description

What is the purpose of this pull request?

This pull request:

• Adds implementation of stats/base/dists/halfnormal/mgf.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Tracking issue for complete implementation of @stdlib/stats/base/dists/halfnormal package #9416

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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{{TODO: add disclosure if applicable}}

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/halfnormal/mgf	$\color{green}284/284$ $\color{green}+0.00%$	$\color{green}17/17$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}284/284$ $\color{green}+0.00%$

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

[shubham220420]

Hey @kgryte & @Planeshifter I have taken reference from normal/mgf for this feature, looking forward if any change is required!

[Neerajpathak07]

@shubham220420 Left a few initial comments I'll suggest you to refer https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dists/halfnormal/stdev in-order to streamline this PR!!

[shubham220420]

I took reference from halfnormal/stdev and followed the updated code structure @Neerajpathak07 , Looking forward for a review