Added sharedprefs monitor for Android

[CDuPlooy]

This adds in functionality to monitor usage of the Android shared preferences (includes Jetpack encrypted shared preferences)

To use, issue the command android sharedprefs monitor, you can specify that only encrypted shared prefs should be monitored using the flag --encrypted-only

I'm just doing one or two last test cases and will open a complete PR after.

[leonjza]

Just checking on this one, is this the complete PR in the end? :) Got a test app to play with maybe?