Feature Request: Add bg (background) control of combined lamps like Yeelight Meteorite

Hi, first thx for your effort to make this software. I bought a Yeelight Meteorite, see here.

This is the output of the status request:

Bulb parameters:
* bg_hue: 229
* hue: None
* color_mode: 2
* name: None
* power: off
* music_on: None
* bg_rgb: 12543
* bg_power: off
* delayoff: 0
* rgb: None
* bg_sat: 100
* bright: 5
* active_mode: 0
* bg_ct: 6487
* current_brightness: 0
* flowing: 0
* nl_br: 0
* bg_bright: 25
* ct: 2737
* bg_flowing: 0
* sat: None

Would be really nice if you could add a possibility to control the "bg_" related parameters an a similar way as it is possible for the none "bg_" parameters.

Bye,

Daniel