ExposeSensor write/update value

[farmio]

An ExposeSensor value currently gets overwritten by a Telegram from the KNX bus. This is equivalent to a communication object with the write and update flags set.

If we expose a value from HA and the ExposeSensor receives a GroupValueRead request it will respond with its latest received value instead of the last value from HA.

We could add a update_from_bus: bool attribute for ExposeSensor devices that prevent it from processing GroupValueWrite and GroupValueResponse telegrams.

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I just sumbled over this in tests. I'm not sure if this is is a real-word problem because the GA the ExposeSensor sends to should not be used to send by other devices imho but I may have overlooked something.

[github-actions]

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