[FEATURE] Light power consumption

[Daibutt]

Is your feature request related to a problem? Please describe.
Not a problem, a future feature request.

Describe the solution you'd like
Power consumption for Hive bullbs is available in the app (albeit a Beta feature), it would be nice if this data got pulled into HA too.

Describe alternatives you've considered
Alternatively I could use the power reported by the app for each bulb at say 100% and 50%, and then set up a bunch of template sensors for bulbs that calculate power. (i.e. if light A is on at 100%, light A power = 8.0W).
Would be easier if power data was read directly from each bulb.

Additional context