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


gulp
          .src([
            GENERIC_DIR + "build/{pdf,pdf.worker,pdf.sandbox}.js",
            GENERIC_DIR + "build/{pdf,pdf.worker,pdf.sandbox}.js.map",
            SRC_DIR + "pdf.worker.entry.js",
          ])
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src([
            GENERIC_LEGACY_DIR + "build/{pdf,pdf.worker,pdf.sandbox}.js",
            GENERIC_LEGACY_DIR + "build/{pdf,pdf.worker,pdf.sandbox}.js.map",
            SRC_DIR + "pdf.worker.entry.js",
          ])
          .pipe(gulp.dest(DIST_DIR + "legacy/build/")),
        gulp
          .src(MINIFIED_DIR + "build/pdf.js")
          .pipe(rename("pdf.min.js"))
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src(MINIFIED_DIR + "build/pdf.worker.js")
          .pipe(rename("pdf.worker.min.js"))
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src(MINIFIED_DIR + "build/pdf.sandbox.js")
          .pipe(rename("pdf.sandbox.min.js"))
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src(MINIFIED_DIR + "image_decoders/pdf.image_decoders.js")
          .pipe(rename("pdf.image_decoders.min.js"))
          .pipe(gulp.dest(DIST_DIR + "image_decoders/")),