Device transition time should support decimal places

[ste-fle]

Is your feature request related to a problem? Please describe. The Hue bridge always applies a fast transition to light changes so they're not instant which might seem wonky. The frontend allows this too via the "settings (specific)" tab of a device (bulb). This input (input type=number) only allows integers and in my opinion 0 (instant) is too fast and 1s is too slow. According to this discussion https://github.com/Koenkk/zigbee2mqtt/issues/1260#issuecomment-473430442 it should be possible to use decimal places but the frontend doesn't support this because the "input type=number" only allows to enter digits.

Describe the solution you'd like The frontend should either allow to enter decimal places (e.g. "0.1") or the user input should be in ms and converted to s in the background.