Feature Request: Transpile worker JS files

[Kerrick]

I'd love to be able to transpile the worker JS files with the same plugins & options as set in the application's ember-cli-babel options in ember-cli-build.js. For example, I'd love to be able to use this kind of code in a worker:

export default class ExampleWorker {
  #privateMember = 'hello world';
  greet() {
    return this.#privateMember;
  }
}

That kind of code does work in my application, since I've got my ember-cli-build.js file looking like this in the relevant parts:

  let app = new EmberApp(defaults, {
    babel: {
      plugins: [
        [require.resolve("@babel/plugin-proposal-decorators"), { "legacy": true }],
        [require.resolve("@babel/plugin-proposal-class-properties"), { "loose": true }],
        [require.resolve("@babel/plugin-proposal-private-methods"), { "loose": true }],
      ],
    },
  });

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Normally I'd make a PR rather than a feature request, but I don't know enough about Broccoli to make this happen.