Exposes certain Settings fields as SystemApi for SUW.

User Setup related fields in Settings indicating the setup
personalization state are now exposed.

Global Settings fields indicating whether the device is in demo mode,
a password is required to decrypt the device, and if mobile data is
enabled for provisioning are now exposed.

Various Secure Settings fields are also now exposed. They indicate
information about  doze, user setup information, lock screen
notification settings, assist gesture setup, and whether a suggested
action was completed.

All of the exposed fields require the WRITE_SECURE_SETTINGS permission.

Bug: 116689780
Test: manual (run setup wizard)
Change-Id: If8a96cca216b1d3e3b9329a3f4695caf9f3f248a