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


createBuildNumber,
    "locale",
    function scriptingChromium() {
      const defines = builder.merge(DEFINES, {
        CHROME: true,
        SKIP_BABEL: false,
      });
      return merge([
        buildDefaultPreferences(defines, "chromium/"),
        createTemporaryScriptingBundle(defines),
      ]);
    },
    function createChromium() {
      console.log();
      console.log("### Building Chromium extension");
      const defines = builder.merge(DEFINES, {
        CHROME: true,
        SKIP_BABEL: false,
      });
      const CHROME_BUILD_DIR = BUILD_DIR + "/chromium/",
        CHROME_BUILD_CONTENT_DIR = CHROME_BUILD_DIR + "/content/";
      const CHROME_WEB_FILES = [
        ...COMMON_WEB_FILES,
        "!web/images/toolbarButton-openFile.svg",
      ];
      
      rimraf.sync(CHROME_BUILD_DIR);
      const version = getVersionJSON().version;
      return merge([
        createMainBundle(defines).pipe(