feat: battery level and state sensors

[Rocka84]

This is a quick and dirty implementation of two new sensors for the state and level of my laptop battery.

I didn't add any config options, I hope this is okay for now. Maybe you could add those? Or guide me to it?

[muniter]

Hello, Thank you for your contribution. The code looks good!

So far as you've seen all sensors are enabled by default. So there's no need for config options to work. But in this case is the kind of sensor I would like to be able to disable. I use it on a desktop so don't have a battery and don't want the sensor in HA, and from the code I can see It would just report it as discharging perhaps?.

So I might work soon on the logic of enabling and disabling sensors, and merge this two new sensors! Thanks again!

[muniter]

Hey @Rocka84 thank you for your contribution. I have added your changes in 792b16c went ahead and made a few changes. And now is also posible to disable sensors in the config. So desktop users don't have any problems.

[Rocka84]

Nice 👍

[sonarcloud]

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