FEATURE Add support for Android 10 background geolocation

[dzziwny]

On Android 10, API 29, to share location in the background, the user has to choose Always authorization status, while currently plugin returns status Granted for both: Always and Always While-in-us.

https://developer.android.com/training/location/request-updates#request-background-location

[danfleck]

On iOS I saw this also, but it's not a problem. It's Apple's "provisional always authorization". See https://developer.apple.com/documentation/corelocation/cllocationmanager/1620551-requestalwaysauthorization

[dpa99c]

I have updated this issue because the plugin requires changes only for Android 10.

The iOS 13 API has not changed although the behaviour of iOS 13 has changed with its temporary authorization of background location.

[dpa99c]

This has been published in v5.0.2