Add JobScheduler support in factor controller

Initializes the JobScheduler constants string in Global Settings and
takes it through the parsing of creating a map with the key:value pairs
linked to the JobScheduler policy. Also changes the way the getter
methods work to take a factor policy so we can know what policy to
change.

Bug: 195056296
Bug: 195056102
Bug: 195055895

Test: Manual
Change-Id: Id82101b2a045dd14bb8eacfbe51c363b4bafb1ce