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


peerDependenciesMeta: {
      "worker-loader": {
        optional: true,
      },
    },
    browser: {
      canvas: false,
      fs: false,
      http: false,
      https: false,
      url: false,
      zlib: false,
    },
    format: "amd", 
    repository: {
      type: "git",
      url: DIST_REPO_URL,
    },
  };
  return createStringSource(
    "package.json",
    JSON.stringify(npmManifest, null, 2)
  );
}
gulp.task(
  "dist-pre",
  gulp.series(
    "generic",
    "generic-legacy",
    "components",