refactor: use modern NodeJS code

[favna]

The NodeJS script was build for old NodeJS versions. In the current day and age we can write a lot cleaner code. The new script targets NodeJS v18 and above.

Notable differences:

• ESM for top level await and import syntax
• node: imports
• Node's native promise based API for fs and setTimeout
• File URLs over path joining
• Optional chaining
• Object.values and for...of looping instead of for...in looping