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

[rautelaKamal]

This PR adds a C implementation for @stdlib/stats/base/dists/erlang/logpdf.

Closes #3571

Changes

• Added src/addon.c: Node.js native addon entry point

• • Added src/main.c: C implementation delegating to stdlib_base_dists_gamma_logpdf
• • Added include/stdlib/stats/base/dists/erlang/logpdf.h: C header file
• • Added lib/native.js: JavaScript wrapper for native addon
• • Added benchmark/benchmark.native.js: Native benchmark
• • Added manifest.json: Build manifest
• • Updated package.json: Added gypfile, include, and src directories

• Read, understood, and followed the contributing guidelines

AI Assistance

• I have used AI-assisted tools for some of the changes in this PR.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/erlang/logpdf	$\color{green}246/246$ $\color{green}+0.00%$	$\color{green}11/11$ $\color{green}+0.00%$	$\color{green}3/3$ $\color{green}+0.00%$	$\color{green}246/246$ $\color{green}+0.00%$

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

[kgryte]

We should go ahead and migrate to using random/array/uniform and random/array/discrete-uniform directly, as done in other dists packages.

[rautelaKamal]

I've migrated the benchmarks to use random/array/uniform and random/array/discrete-uniform in the latest push. This PR should be ready for re-review.

[kgryte]

We should go ahead and use isAlmostSameValue for ULP-based testing.

[rautelaKamal]

I've migrated the tests to use isAlmostSameValue for ULP-based testing in the latest push. This PR should be ready for re-review.