refactor init package

[thescientist13]

Type of Change

Enhancement

Summary

The current init package uses a lot of instances of mixed sync and async languages, often times in "conflict" with each other, for example

await Promise.all(
  templateFiles.map(async file => {
    const resolvedPath = path.join(templateDir, file);
    
    if (fs.lstatSync(resolvedPath).isDirectory()) {
      return await copyFolder(resolvedPath, TARGET_DIR);
    } else if (await fs.existsSync(resolvedPath)) {
      return await fs.copyFileSync(
        resolvedPath,
        path.join(TARGET_DIR, file)
      );
    }
  })
);

Details

So would be good to do some refactoring

1. Consistent usage of async / await, use for ... of loops to make things cleaner
2. Leverage URL+ fs.promises as much as possible instead of path
3. See if we can leverage more out of the box fs operations for copying functionality

[thescientist13]

I think in light of #1279, there will be a significant amount of rewriting anyway, and so by nature of working on that, I anticipate things will get refactored automatically, so can defer this work.