Change type to Time for appropriate entities

[JvdMaat]

Currently looking at washer and dryer runtime (or initial time, countdown time, etc) history looks like an ugly bar graph: Can these entity types be updated to Time? That way they would correctly show as a line graph? Ditto I suppose with the Tub Clean Counter, which should be a number, not a string. (Or is there something else required to make that happen? Anything I can tweak on my end to fix this?)