Adding LauncherApps apis for suspended packages

The suspending app can provide a Bundle of information to be used by the
launcher for handling suspended packages. Added APIs:
 - getSuspendedPackageLauncherExtras(String, UserHandle): To retrieve
 the launcher extras for the given package and user.
 - Callback#onPackagesSuspended(String[], UserHandle, Bundle): A
 callback that will be invoked with the package names and the launcher
 extras whenever sent packages are suspended.

Test: atest com.android.server.pm.SuspendPackagesTest

Bug: 76119578
Change-Id: I505d134809639a57c3314f994af34d576d905e74