Add ability to show/set fan_speed and water_grade

[trancefam]

Clicking on the fan speed will show a dropdown and call the vacuum.set_fan_speed service after selection:

Clicking on the water grade will show a dropdown and call the select.select_option service after selection:

The water grade assumes the naming pattern of "select." + vacuum_name + "_water_grade", which is the default when generated by mqtt (at least for my s5 max)

[TheLastProject]

Your change introduced a very annoying flickering effect every few seconds:

https://user-images.githubusercontent.com/1885159/148106832-a0600b4f-937b-44e3-8961-813d6433d23c.mp4