[android] Add debugging for 'Battery Optimisation' and related settings

[bengtan]

It turns out RNBGL has a few APIs to help out with app battery optimisation issues.

See: https://transistorsoft.github.io/react-native-background-geolocation/interfaces/_react_native_background_geolocation_.devicesettings.html#isignoringbatteryoptimizations

Before we start making use of these in the app, we should add them to a debug section/screen so QA can test them first. We need to test them on a number of different android phones to see how well they work before we implement them into end-user-visible screens.

Please:

• Add a new debug screen or section which:
• Displays the value returned by isIgnoringBatteryOptimizations()
• Calls showIgnoreBatteryOptimizations() and:
  • Displays the values (of type DeviceSettingsRequest) returned by showIgnoreBatteryOptimizations()
  • Allows the user to optionally open the per-vendor 'Battery Optimisations' screen (ie. call show())
• Calls showPowerManager and:
  • Displays the values (of type DeviceSettingsRequest) returned by showPowerManager
  • Allows the user to optionally open the per-vendor 'Power Manager' screen (ie. call show())

This will allow QA to test, on a variety of android phones, whether:

• The value returned by isIgnoringBatteryOptimizations() is correct,
• What the screens opened via showIgnoreBatteryOptimizations() and showPowerManager are (or whether they even exist at all)

[bengtan]

4816 was posted which is sorta related to this.

I see #4816 as the next step after this ticket once we've tested this to our satisfaction.