feat: add C implementation for @stdlib/stats/base/dists/lognormal/logpdf

[rautelaKamal]

Description

What is the purpose of this pull request?

This pull request:

• Adds a C implementation for evaluating the natural logarithm of the probability density function (PDF) of a lognormal distribution (@stdlib/stats/base/dists/lognormal/logpdf), and includes the corresponding native N-API bindings following the DDD_D pattern found in similar modules like arcsine/logpdf.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• #3751

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.

AI Assistance Disclosure

• Yes
• No

If yes, how was AI used?
I used an AI assistant to help stub out the initial C boilerplate (header files, build configurations) and to mirror the JS test suite into native tests, which I then carefully reviewed and validated against stdlib guidelines before submitting.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

[stdlib-bot]

Coverage Report

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