Allow CROP app to control heaters/ ventilation units

[nbarlowATI]

There are plans in place to use the Hyper.ag platform to control (initially) heaters, and (later) ventilation units.
They would use temperature measurements from individual sensors to determine when to power the unit on/off. It would be even better if we could use the forecast from the CROP app to control these devices - this way we would avoid the problem of undershooting / lag where the temp would continue to fall for a while even after the heater is turned on.

Need to investigate the best way to do this - send POST request to an API endpoint (maybe integrating with Hyper.ag?)