Add protractor tester chrome extension

feat(extension): Add protractor tester chrome extension

- Added a chrome extension that is launched with the element explorer to test locators and find locator suggestions.
- Changed the element explorer to listen on port 13000 for locators to test.
- Added a note to the elementexplorer welcome message about the dev tools.

can you rename this locatorFinder.js to match with the rest of the lib files?