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


"integrationtest",
  gulp.series(setTestEnv, "generic", function runIntegrationTest() {
    return createTestSource("integration");
  })
);
gulp.task(
  "fonttest",
  gulp.series(setTestEnv, function runFontTest() {
    return createTestSource("font");
  })
);
gulp.task(
  "makeref",
  gulp.series(setTestEnv, "generic", "components", function runMakeref(done) {
    makeRef(done);
  })
);
gulp.task(
  "botmakeref",
  gulp.series(
    setTestEnv,
    "generic",
    "components",
    function runBotMakeref(done) {
      makeRef(done, true);
    }
  )
);
gulp.task(
  "typestest",