Sensors as favourites in WearOS

**Is your feature request related to a problem? Please describe.**

When using different watch faces and trying out new ones it's very frustrating to select for instance temperature sensors from HA as complications in the watch face. #2804 made it better, but it's still a lot of sensors to scroll through.

**Describe the solution you'd like**

I would like it to be possible to add sensors as favourites.