Addressable CWWW support (based on WS2811)

**Describe the problem you have/What new integration you would like**

CWWW light strips now come in addressable fashion, such as https://fr.aliexpress.com/item/1005005069644213.html. The two white channels (2700k and 6500k) are mapped are mapped to RED and GREEN channels.

**Please describe your use case for this integration and alternatives you've tried:**

Be able to set colour temperature for those addressable light strips.

**Additional context**

I think it's possible to emulate it via a custom light component, or light template in HA. But I'd wager it would make sense to add it directly in ESPHome, since it already has the `cwww` component. Perhaps the RED and GREEN channels could be exposed as output components?

Start with ESPHome’s existing `cwww` component and the WS2811-based addressable-light path, then compare the proposed custom light or light-template approach with exposing output components. Done means supporting colour-temperature control for strips whose 2700K and 6500K channels are mapped to red and green.

Written by the indexing model from the issue text.