feat: add C implementation for stats/base/dists/erlang/cdf

[Lokeshranjan8]

Resolves #3568 .

Description

What is the purpose of this pull request?

This pull request:

• adds C implementation for stats/base/dists/erlang/cdf along with relevant docs, tests, examples and benchmarks

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

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.

AI Assistance

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

• Yes
• 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}}

---

@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/erlang/cdf	$\color{green}287/287$ $\color{green}+0.00%$	$\color{green}11/11$ $\color{green}+0.00%$	$\color{green}3/3$ $\color{green}+0.00%$	$\color{green}287/287$ $\color{green}+0.00%$

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

[Neerajpathak07]

@Lokeshranjan8 Have left out an inital round of comments. Mainly you'll have to check your implementation and rectify which dtype k uses and which corresponding macro will be required for it.
To get a good idea of the current code convention for these pacakges take a look at:- https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dists/wald/pdf

[Lokeshranjan8]

@Neerajpathak07 Thanks for the help