* Add Home Assistant auto discovery feature
Add HA auto discovery to RF2.
For each unique combination of unit, groupbit and address a switch will be added to Home Assistant called: "RF2_[unit]_[groupbit])_[address].
As RF2 433Mhz switches do not render their state, no state topic will be provided in the discovery.
This will cause the switch to be in optimistic mode in HA with separate on and off icons.
The two separate on/off icons allow for subsequent on commands to support the dimming feature of KAKU switches like ACM-300.
Co-authored-by: hbraam <hbraam@users.noreply.github.com>
