feat: add C implementation for `stats/base/dists/erlang/mgf`

[Neerajpathak07]

Resolves #3573.

Description

What is the purpose of this pull request?

This pull request:

• Adds C implementation for stats/base/dists/erlang/mgf

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• #3573

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.

• [x] Read, understood, and followed the contributing guidelines

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• [ ] Yes
• [x] No

If you answered "yes" above, how did you use AI assistance?

• [ ] Code generation (e.g., when writing an implementation or fixing a bug)
• [ ] Test/benchmark generation
• [ ] Documentation (including examples)
• [ ] Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

{{TODO: add disclosure if applicable}}

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/erlang/mgf	$\color{green}311/311$ $\color{green}+0.00%$	$\color{green}21/21$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}311/311$ $\color{green}+0.00%$

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