When the application is being debugged with `--debug-brk --bundle`
options, the JS implementation objects handling the debugging protocol
are created after their corresponding domains' `enable` methods have
been called by the debugger frontend. As a workaround we now manually
call `enable` in their constructors.
related to https://github.com/NativeScript/ios-runtime/issues/1055 and
https://github.com/NativeScript/ios-runtime/issues/1057
* add initial implementation of the dom agent for ios
* add implementation of the css agent for ios
* refactor devtools inspector methods to somewhat accomodate ios and android
patch elements dom-node tests to test for ios too
* fix android dom-node test
* fix ios dom-node-tests to mock the ios devtools inspector properly
* fix: minor changes
