Allow to send commands to Tuya Light when it is in off state

[parautenbach (Pieter Rautenbach)]

This is closely related:

Add `light.adjust` service call · home-assistant/architecture · Discussion #537

From this discussion/FR:

Add action to update light state without turning on

I’ve noticed a few threads where people want to change the brightness of a light but not turn it on. This is particularly useful if you have a group of lights, some are on, and you only want to dim the ones that are currently on. Looking at the code, the crux of the issue is that the light service only supports turn_on turn_off and toggle. Could we add an action config_change that takes all the parameters of toggle. It would function exactly the same as toggle does, but not change the on/off s…