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.task(
  "mozcentraldiff",
  gulp.series(
    "mozcentral",
    "mozcentralbaseline",
    function createMozcentralDiff(done) {
      console.log();
      console.log("### Creating mozcentral diff");
      
      
      
      
      
      rimraf.sync(MOZCENTRAL_BASELINE_DIR + "*");
      gulp
        .src([BUILD_DIR + "mozcentral/**/*"])
        .pipe(gulp.dest(MOZCENTRAL_BASELINE_DIR))
        .on("end", function () {
          safeSpawnSync("git", ["add", "-A"], { cwd: MOZCENTRAL_BASELINE_DIR });
          const diff = safeSpawnSync(
            "git",
            ["diff", "--binary", "--cached", "--unified=8"],
            { cwd: MOZCENTRAL_BASELINE_DIR }
          ).stdout;
          createStringSource(MOZCENTRAL_DIFF_FILE, diff)
            .pipe(gulp.dest(BUILD_DIR))
            .on("end", function () {
              console.log(
                "Result diff can be found at " +
                  BUILD_DIR +