Add multiple battery support to nyx-modules

[Herrie82]

Is your feature request related to a problem? Please describe.
Currently nyx-modules only supports a single battery as per https://github.com/webosose/nyx-modules/tree/master/src/battery

Describe the solution you'd like
With the PinePhone(Pro) keyboard with it's integrated battery, there are 2 batteries in the device, however nyx-modules can only deal with a single one. Expand nyx-modules, batteryd, luna-next-cardshell to deal with multiple battery devices and display the status of each individual battery

[Herrie82]

Send a request to OSE support for batteryd component to be opensourced

[Herrie82]

Send a request to OSE support for batteryd component to be opensourced

Denied, however decided to split it off from powerd into com.webos.service.battery and retired powerd (just like OSE did). We now remain with sleepd, com.webos.service.power2 and com.webos.service.battery