[Feature] support ModuleWorkers

[TrySound]

https://html.spec.whatwg.org/multipage/workers.html#module-worker-example

[Narvey]

Yuck, so the readme says to do import Worker from './file.worker.js';, but you actually can't yet?

[michael8090]

For now worker-loader doesn't support cross origin files, maybe we can support it by:

1. using new Worker('https://some.other.origin/my-worker-script.js', {type: 'module'}), or
2. using JSONP

What do you guys think?

[raphaelbs]

Chrome 80 shipped with support for this: https://www.chromestatus.com/feature/5761300827209728

How about adding an option to enable it? Jason Miller made this gist to check support for module workers.

[alexander-akait]

Done #255, you can set worker options, docs will be updated in the near future