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


createStandardFontBundle().pipe(
          gulp.dest(MOZCENTRAL_CONTENT_DIR + "web/standard_fonts")
        ),
        preprocessHTML("web/viewer.html", defines).pipe(
          gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")
        ),
        preprocessCSS("web/viewer.css", defines)
          .pipe(
            postcss([
              autoprefixer({
                overrideBrowserslist: ["last 1 firefox versions"],
              }),
            ])
          )
          .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
        gulp
          .src("l10n/en-US/*.properties")
          .pipe(gulp.dest(MOZCENTRAL_L10N_DIR)),
        gulp.src("LICENSE").pipe(gulp.dest(MOZCENTRAL_EXTENSION_DIR)),
        gulp
          .src(FIREFOX_CONTENT_DIR + "PdfJsDefaultPreferences.jsm")
          .pipe(transform("utf8", preprocessDefaultPreferences))
          .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR)),
      ]);
    }
  )
);
gulp.task(
  "chromium",
  gulp.series(