Added Cloud-API Support

When your Wallbox is not part of your HA-Network, then you can now make use of the Cloud API Version of this integration.
https://github.com/goecharger/go-eCharger-API-v2/blob/main/cloudapi-en.md

Please note, that might be that not all features are supported [I am currently aware of the RESET functionality - but there might be more]

Solves #8