TARE Global Toggle

Add functionality to the global toggle within the TARE homepage in the
developer settings. This allows for users and developers to turn these
settings on/off.

Bug: 195552339

Test: Manual (open Settings > System > Developer Options > TARE > turn
on/off the global toggle and leave and go back and make sure it is being
kept track of correctly)

Change-Id: Ifb8dee1aeb04d2b6883ee9e449ed8ab0493dc27a