feat: add C implementation for @stdlib/stats/base/dists/poisson/entropy

[rautelaKamal]

Closes #3786

Changes:

• Added src/main.c: C implementation of the Poisson entropy
• Added src/addon.c: Node.js native addon entry point
• Added include/stdlib/stats/base/dists/poisson/entropy.h: header
• Added lib/native.js: native wrapper
• Added test/test.native.js: native tests mirroring test.js
• Added benchmark/benchmark.native.js: native benchmark
• Added benchmark/c/benchmark.c and Makefile: C benchmarks
• Added examples/c/example.c and Makefile: C examples
• Added manifest.json, binding.gyp, include.gypi, src/Makefile
• Updated package.json with gypfile and include/src directories
• Updated README.md with C APIs section

Resolves #{{TODO: add issue number}}.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/poisson/entropy	$\color{green}204/204$ $\color{green}+100.00%$	$\color{green}12/12$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}204/204$ $\color{green}+100.00%$

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