Add Support for Address String Input in Google Router's Directions Method

[Jovillios]

This pull request addresses an inconsistency between the documentation and the functionality of the Google router's directions method. While the documentation suggests that it's possible to provide an address string instead of coordinates or waypoints, the current implementation doesn't support this. However, the Google Maps API does allow address strings.

To resolve this, I've implemented support for address strings in the directions method of the Google router. This enhancement aligns the functionality with the expected behavior outlined in the documentation.

[chrstnbwnkl]

thanks @Jovillios we haven't been updating the non open source routers, and are not really that interested in them anymore, but since this is just a small fix we'll go with it :)