Feature request - Configurable poll frequency

[cbrherms]

I've a new purifier (3250i) set up in a room that has widely variable pollutant levels. While it's in auto mode and clearing things up relatively quickly, I'd like to track this a bit better within HA.

Believe changing the update interval to a configurable value would allow better insight. Ideally, I'd want to drop my poll time down to 60s or 30s, as my purifier is updating the cloud at a much finer detail when looking at the graphs within the app.