Update Integration of Keba charging station (#30125)

* fixed parsing of current to float in service set_current

* Added optional name in the config file in order to get a better entety naming (easier to find)

* fix parsing of all parameters to service calls

* addressed code review comments + updated pypi dependency

* config name imported from cont.py + minor naming changes to be more clear about the meaning of a sensor

* removed name in config again, use product name gathered from the charging station instead

* implemented suggested changes

* changed variable naming as requested