Add support for LauncherUersInfo config

This is a bundle that contains additional configurations for this user
in launchers. For now, this has a boolean key
'private_space_entrypoint_hidden' indicating whether private space
should be hidden in launcher when locked.

Flag: android.multiuser.add_launcher_user_config

Bug: 346553745
Test: Manual - verified on device with launcher3
Test: atest LauncherAppsTests

Change-Id: I9c88bb6bfbbd0d7d01a3bcb0335201f1a89517e4