Migrate AppCompaction settings to DeviceConfig APIs.

To support app compaction P/H experiments, migrate it's
settings away from using the key/value pair string the
rest of ActivityManagerConstants uses, and use the
DeviceConfig APIs instead.

Test: boots, works, atest FrameworksServicesTests:AppCompactorTest

Bug: 122879579

Change-Id: I9d1ae17d9671d0443b728ecdeca7102ba34d9c2f
7 files changed