Upgrade to selenium 4 #278

As a user of sentinel, I want Selenium 4 integrated to take advantage of the latest features.

https://blog.kloia.com/selenium-4-0-released-new-features-comparison-with-previous-versions-and-more-5675bf079040

After integration I would like to:

1. Ensure capabilities are refactored to options (I believe this is already done.)
2. All waits are using Duration (I believe they already are.)
3. Add support of relative locators in the page object so that coding does not need to be done to utilize this feature.
4. Window and tab opening is using the new functionality (if supported by appium for the Windows driver.)
5. Look into the benefits of the DevTools protocol for Debug mode.
6. Upgrade Grid support to use the new Docker functionality.