The sensor platform has to read the native_value multiple times
during the state write cycle which means the integration calculated
the value multiple times. Switch to using _attr_native_value to
ensure the calculations in the library are only done once per
state write.
To demonstrate this issue,
+ _LOGGER.warning("Fetch name value for %s", self.entity_id)
was added to `def native_value`:
```
2024-04-14 06:58:52.506 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_current_consumption
2024-04-14 06:58:52.506 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_total_consumption
2024-04-14 06:58:52.507 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_today_s_consumption
2024-04-14 06:58:52.507 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_voltage
2024-04-14 06:58:52.508 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_current
2024-04-14 06:58:52.509 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_current_consumption
2024-04-14 06:58:52.510 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_total_consumption
2024-04-14 06:58:52.510 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_today_s_consumption
2024-04-14 06:58:52.510 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_voltage
2024-04-14 06:58:52.510 WARNING (MainThread) [homeassistant.components.tplink.sensor] Fetch name value for sensor.kasa_smart_plug_542b_0_kasa_smart_plug_542b_0_current
```
269429aa0c