Allow using remote Chrome with puppeteer

Puppeteer allows connecting to chrome via a web socket or URL.

See: [Puppeteer docs](https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#puppeteerconnectoptions)

This would disallow using args (they'd have to be added on the browser-side), though.

Proposal:
Add a `remoteOptions` key to `engineOptions` (or maybe a separate `remote: bool` flag, too?); when this is filled, use `await puppeteer.connect()` instead of `puppeteer.launch()`.

Use cases:
- It would be beneficial mainly for dockerized environments, as it would be more in-line with the docker way (one process per container).