Add Fan Rotation Speed support to Homekit mapping

Currently there is support for ON, OFF, OSCILLATING and DIRECTION.
Speed is missing. Details from HAP specs:

UUID: |00000029-0000-1000-8000-0026BB765291
Type: public.hap.characteristic.rotation.speed
Permissions: Paired Read, Paired Write, Notify
Format: float
Minimum Value: 0
Maximum Value: 100
Step Value: 1
Unit: percentage

Thx!

Interesting, I do not see oscillating in the HAP spec. But yes, I would also like to see speed added.