Add auto lock preference inside private space settings

This includes below changes
- Adds perference for Auto Lock settings inside private space settings page.
- Feaure is behind flag
android.multiuser.support_autolock_for_private_space

Screenshots:
go/ss/ZCaYGWMDdH8bQNz.png
go/ss/AxnD8DviiT5hhkW.png
go/ss/9TMYmacyiVhyexB.png
go/ss/6SzhkGfTbDYVUVE.png

Bug: 312893140
Test: atest AutoLockPreferenceControllerTest, atest AutoLockPreferenceControllerTest

Change-Id: I95beb9d71c709002e17307e612c60b2f5087290b