WebWorker support?

Hi I just discovered esbuild, coming from Parcel. One thing I like about parcel is that if I instaniate a WebWorker with the string literal filename, like
```javascript
const ww = new Worker ('./myWorker.js')
ww.postMessage('work!')
```
Parcel will recognize the `Worker` constructor and create another bundle starting at `./myWorker.js`. It also handles cache busting for the filename. So the bundle would be called `./myWorker8a68r8912q.js` or something and that string would be updated in the code above.

Does ESBuild do something like that? If not, where would I look to implement that?

No files or tests are named. Start by checking whether esbuild currently recognizes the sample `new Worker('./myWorker.js')` pattern and how it creates bundle entry points. Done means supporting the worker bundle and updating the referenced filename with cache-busting output, with tests covering the behavior.

Written by the indexing model from the issue text.