* /v1/config/{path} supports setting single config value (post body). Lists are
supported as well by using the index:
- general/latitude (value: 55.55)
- optimize/ev_available_charge_rates_percent/0 (value: 42)
Whole tree can be overriden as well (no merge):
- optimize/ev_available_charge_rates_percent (value: [42, 43, 44]
* ConfigEOS: Add set_config_value, get_config_value