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


function babelPluginReplaceNonWebpackImports(babel) {
    return {
      visitor: {
        Identifier(curPath, state) {
          if (curPath.node.name === "__non_webpack_require__") {
            curPath.replaceWith(babel.types.identifier("require"));
          } else if (curPath.node.name === "__non_webpack_import__") {
            curPath.replaceWith(babel.types.identifier("import"));
          }
        },
      },
    };
  }
  function preprocess(content) {