New module: display the battery percentage of attached devices

## What should it do?

If the computer has attached bluetooth devices with batteries in them, display the battery charge percentages.

```
❯ ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i trackpad -A 20 | grep BatteryPercent

❯ ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i keyboard -A 20 | grep BatteryPercent
```