Enables storage of separate lock screen live wallpaper metadata

Adds storage of lock screen live wallpaper metadata, creates separate
functions for home and lock effects, and updates check if cached
home/lock live wallpaper metadata are current to use service name
instead of package name.

Tests will be added as follow-ups because test architecture changes are
needed.

Bug: 267479837
Test: added as follow-ups
Change-Id: I219110df58007d6766234a03c474f960cb671bdf
6 files changed