Service worker support

[johncoates-st]

browser.network.traffic isn't working for traffic that happens in service workers. Has this been considered? I could put together a pull request if pointed in the right direction for implementing this feature.

[route]

@johncoates-st you could check https://chromedevtools.github.io/devtools-protocol/tot/ServiceWorker/ and then:

1. Add ServiceWorker.enable feature in https://github.com/rubycdp/ferrum/blob/main/lib/ferrum/page.rb#L357.
   Though I'm not sure about behavior or if it even fits well network domain.

2. Run one of the specs for network with log debug like: FERRUM_DEBUG=true rspec spec/network_spec.rb:5 and see how CDP communication works for Chrome.

3. For service workers I think you need to add one more endpoint to our test application with some custom JS, and also test the communication.

[johncoates-st]

Thanks for the references and guidance @route

[johncoates-st]

Just created a draft PR based on your guidance.

• [WIP] Service worker support #391