helper min max missing device class

[Bascht74]

The problem

Hi, I added a helpe min/max-entity sensor and I cannot add it to homekit.
The device_class of all sensors is temperature, so the device_class of the helper entity should be temperature as well.
But that isn't the case. Without this device class the sensor will not be added to homekit. The unit_of_measurement °C is not enough...

What version of Home Assistant Core has the issue?

core-2022.8.0b2

What was the last working version of Home Assistant Core?

./.

What type of installation are you running?

Home Assistant OS

Integration causing the issue

min_max

Link to integration documentation on our website

https://home-assistant.io/integrations/min_max

Diagnostics information

./.

Example YAML snippet

./. (UI)

Anything in the logs that might be useful for us?

./.

Additional information

The device_class is not recognized and there is no other way to set it via the created entry in the UI.
I think it should be set automatically if all device_class of the used entities are the same.

[probot-home-assistant]

min_max documentation
min_max source
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[probot-home-assistant]

Hey there @fabaff, mind taking a look at this issue as it has been labeled with an integration (min_max) you are listed as a code owner for? Thanks!
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