fix: set charge current (#581)

Clarified in the doc that it's Europe only (same as other functions) and
added the function to the VehicleManager (needed for setting the value)

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

hyundai_kia_connect_api/ApiImpl.py

@@ -147,7 +147,10 @@ def set_charge_limits(
         pass
 
     def set_charging_current(self, token: Token, vehicle: Vehicle, level: int) -> str:
-        """Sets charge current level (1=100%, 2=90%, 3=60%). Returns the tracking ID"""
+        """
+        Europe feature only.
+        Sets charge current level (1=100%, 2=90%, 3=60%). Returns the tracking ID
+        """
         pass
 
     def set_windows_state(

hyundai_kia_connect_api/VehicleManager.py

@@ -165,6 +165,11 @@ def set_charge_limits(self, vehicle_id: str, ac: int, dc: int) -> str:
             self.token, self.get_vehicle(vehicle_id), ac, dc
         )
 
+    def set_charging_current(self, vehicle_id: str, level: int) -> str:
+        return self.api.set_charging_current(
+            self.token, self.get_vehicle(vehicle_id), level
+        )
+
     def set_windows_state(self, vehicle_id: str, options: WindowRequestOptions) -> str:
         return self.api.set_windows_state(
             self.token, self.get_vehicle(vehicle_id), options