In Webpack 5, the [recommended way](https://webpack.js.org/guides/web-workers/) to create a web worker is

```ts
new Worker(new URL('./worker.js', import.meta.url));
```

Could we update\* the [`pdfjs-dist/webpack` entrypoint](https://github.com/mozilla/pdfjs-dist/blob/master/webpack.js) to use this syntax instead of the legacy `worker-loader`? One of the Webpack contributors told me that `worker-loader` uses "magic" and can cause issues.

\* To maintain compatibility with people still using Webpack 4, we should probably introduce a new entrypoint called `pdfjs-dist/webpack5` (or something like that) rather than changing the existing entrypoint.

Can attempt a PR if you would like.

Closely-related: https://github.com/mozilla/pdf.js/issues/15302


rimraf.sync(dir);
  const COMPONENTS_IMAGES = [
    "web/images/annotation-*.svg",
    "web/images/loading-icon.gif",
    "web/images/shadow.png",
  ];
  return merge([
    createComponentsBundle(defines).pipe(gulp.dest(dir)),
    gulp.src(COMPONENTS_IMAGES).pipe(gulp.dest(dir + "images")),
    preprocessCSS("web/pdf_viewer.css", defines)
      .pipe(
        postcss([
          postcssLogical({ preserve: true }),
          postcssDirPseudoClass(),
          autoprefixer(AUTOPREFIXER_CONFIG),
        ])
      )
      .pipe(gulp.dest(dir)),
  ]);