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.series(
    setTestEnv,
    "generic",
    "components",
    "dev-fitCurve",
    function runXfaTest() {
      return streamqueue(
        { objectMode: true },
        createTestSource("unit"),
        createTestSource("browser", { xfaOnly: true }),
        createTestSource("integration")
      );
    }
  )
);
gulp.task(
  "botxfatest",
  gulp.series(
    setTestEnv,
    "generic",
    "components",
    "dev-fitCurve",
    function runBotXfaTest() {
      return streamqueue(
        { objectMode: true },
        createTestSource("unit", { bot: true }),
        createTestSource("font", { bot: true }),
        createTestSource("browser", { bot: true, xfaOnly: true }),
        createTestSource("integration")
      );