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Add blog post about sensor temperature conversion (#1024)

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* Add blog post about sensor temperature conversion

* Update blog/2021-08-12-sensor_temperature_conversion.md

Co-authored-by: Tom Brien <TomBrien@users.noreply.github.com>

* Document that device_class is mandatory

* Update 2021-08-12-sensor_temperature_conversion.md

Co-authored-by: Tom Brien <TomBrien@users.noreply.github.com>
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---
author: Erik Montnémery
authorURL: https://github.com/emontnemery
title: Temperature conversions moving to SensorEntity
---
Temperature unit conversions are moving from the `Entity` base class to the `SensorEntity` base
class. Unit conversions will only be done if the sensor's `device_class` attribute is set
to `DEVICE_CLASS_TEMPERATURE`. If the `device_class` is not set or is not set to
`DEVICE_CLASS_TEMPERATURE` temperature conversion will take place during a transition
period and a warning will be logged.
To facilitate this, the sensor entity model has been updated with two new properties,
`native_value` and `native_unit_of_measurement`. This allows us to add additional
unit conversions in the future instead of relying on the integrations to do it themselves.
Sensor implementations should no longer implement the `state()` property function or set
the `_attr_state` attribute. Sensor implementations should also not implement the
`unit_of_measurement` property function, set the `_attr_unit_of_measurement` attribute
or set the `unit_of_measurement` member of `EntityDescription`.
### native_value
The value reported by the sensor.
The actual state written to the state machine may be modified by `SensorEntity` due to
unit conversions.
### native_unit_of_measurement
The unit of measurement of the sensor, if any.
The `unit_of_measurement` written to the state machine may be modified by `SensorEntity`
due to unit conversions.