What is the feature?

Description

I have an hourly rate for my electricity price, so I'd like the temperature of my thermostat to be flexible by heating more when electricity is cheap and less when it's expensive. I use the nordpool_diff custom component that outputs an offset , so my idea is that I could just point better-thermostat to this entity and it would add that value to the set temperature. I imagine it may work a bit like the calibration offset, but ideally applied in addition to the calibration.

Additional Information

nordpool_diff is the component I'm using, but this feature can be flexible enough so you could generate the offset anyway you like, it doesn't even have to be the electricity price that drives it.