Update auto-start state for a charge point

Sets auto-start to on or off based on the request body. Returns 400 when the charge point is not eligible (public, or model does not support it) or the requested state matches the current one. The current auto-start status is also exposed on the regular GET /charge-points/{id} response, so a separate read endpoint is not needed. Required scope: charge-points:write </br>Organization authorization: supported