[mqtt.homeassistant] implement non-deprecated color inference for JSON Schema lights...

[mqtt.homeassistant] implement non-deprecated color inference for JSON Schema lights (#17529)

In particular, use the color_mode attribute to tell us which color space to parse in,
instead of trying to guess. Some devices will fill out attributes not-pertinent to
the current color mode, and their math might be... less than optimal.
Also sync color temp and color channels when the color_mode is the opposite.

Signed-off-by: Cody Cutrer <cody@cutrer.us>