make APIs in SettingsToPropertiesMapper accessible from other package

1. make SettingsToPropertiesMapper public but @hidden so that rescue
party can access APIs here
2. make these APIs public static so that it's easier for rescue party to
use
3. move SettingsToPropertiesMapperTest to services/tests/mockingservicestests/
so that we can use ExtendedMockito to mock static method.

Test: Manually on device by calling APIs from RescueParty
Change-Id: I06f0e54a4513d4735214f5013f9523e8c44d4584