Create integration tests

[danez]

We should create integration tests for elf-cam. What we want to test here is if the generated package can be used as promised.

First step run

wasm-pack build --target nodejs

This generates ./pkg folder with the complete package which we can import in javascript/typescript.

import {} from './pkg/'

If we write the tests in typescript we can also test the generated types easily.

This is the example I used for manual testing:

import { readFileSync } from "fs";
import { detect, Platform } from "./pkg/binary-info.js";

const buffer = readFileSync("./tests/data/nsd_3.0.2_Darwin_arm64");

const x = detect(buffer);
console.log(x);
console.log(x.platform, x.arch, x.runtime);
console.log(x.platform === Platform.Darwin);