Add explicit version checks

[camillobruni]

• Add utils/version-check.mjs to warn against invalid nodejs versions
• Add license headers to newly added files, utils and test files

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[danleh]

Regarding the version checks, is there a reason to not use the more builtin checking by adding a .npmrc file with engine-strict=true? AFAIU node already warns if the versions in engines are not fulfilled; with the additional config file it should error out (not tested, just read that at https://stackoverflow.com/questions/29349684/how-can-i-specify-the-required-node-js-version-in-package-json)

Yay to proper license headers :)

[camillobruni]

I've tried the npmrc approach and I didn't work locally :/.

% npm run test:v8

> jetstream@3.0.0-alpha test:v8
> npm run test:prepare && node tests/run-shell.mjs --shell v8


> jetstream@3.0.0-alpha test:prepare
> npm run decompress -- --quiet


> jetstream@3.0.0-alpha decompress
> node utils/compress.mjs --decompress --keep --quiet

RexBench/FlightPlanner/waypoints.js.z
SeaMonster/inspector-json-payload.js.z
wasm/argon2/build/argon2.wasm.z
file:///Users/test/Documents/jetstream/tests/helper.mjs:1
import { styleText } from "node:util";
         ^^^^^^^^^
SyntaxError: The requested module 'node:util' does not provide an export named 'styleText'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:123:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:189:5)

Node.js v19.6.0

[danleh]

Ah well, let's go with the explicit version check script then (unless Keith or someone else has an idea).

[kmiller68]

LGTM too. I don't know a better way to test node's version either. We can always remove this if we find a better way to test.