Add preference to enable Remote Debugging for Android 4.4+ (KitKat) Chrome based WebView

You have to explicitly enable remote debugging for kitkat chrome-based webview:
https://developers.google.com/chrome-developer-tools/docs/remote-debugging#debugging-webviews

As far as I am aware there are no performance implication to leaving this flag on at all time (i.e. when releasing your app) – however, the feature was implemented as an opt-in so that users cannot inspect your webview based application without your (the developer) explicit consent. I think cordova should respect that decision and leave the preference off by default.

CB-3494 is related.