support for power_supply on cww light

**Describe the problem you have/What new integration you would like**
CWWW light use custom powerful psu, but the option was not accpted for light.cwww

**Please describe your use case for this integration and alternatives you've tried:**
tody we need to use on_turn_on and on_turn_off, but with multiple conditions if more than a led strip is used

**Additional context**

No files or tests are named. Start by locating the light.cwww implementation and its existing power_supply configuration, then review how on_turn_on and on_turn_off behave with multiple LED strips. Done should mean the requested power-supply option is accepted for CWWW lights and the intended multi-strip conditions are covered by tests or documented behavior.

Written by the indexing model from the issue text.