Add AppInfo flags and APIs for 16Kb appcompat

- Adding flags to save alignment info and override info for
16kB app compat mode.
- Parse manifest option
- APIs to set appcompat mode. Clients will be packageManger and settings

Flag: android.content.pm.app_compat_option_16kb
Test: atest -c FileSystemUtilsTests
Test: Install 4KB aligned app and see the dialog on 16 KB device
Bug: 363338964

Change-Id: I742d70493d7a5e48eeee8eb4445a7f3d0f62cf64