Log slow UID observer in dumpsys

Sample output:
  mUidChangeDispatchCount=322
  Slow UID dispatches:
    com.android.server.usage.UsageStatsService$2: 0 / Max 0ms
    android.app.IUidObserver$Stub$Proxy: 0 / Max 0ms
    android.app.ActivityManager$UidObserver: 0 / Max 0ms
    com.android.server.pm.ShortcutService$3: 0 / Max 0ms
    android.app.IUidObserver$Stub$Proxy: 0 / Max 0ms
    android.app.IUidObserver$Stub$Proxy: 0 / Max 0ms
    com.android.server.net.NetworkPolicyManagerService$3: 0 / Max 0ms
    com.android.server.AlarmManagerService$UidObserver: 0 / Max 0ms
    com.android.server.job.JobSchedulerService$2: 1 / Max 826ms
    android.app.IUidObserver$Stub$Proxy: 1 / Max 44ms
    android.app.IUidObserver$Stub$Proxy: 0 / Max 0ms
    com.android.server.AppStateTracker$UidObserver: 0 / Max 0ms

Bug: 73505782
Test: Boot and observe dumpsys activity.
Change-Id: I17c971a9690a708c253a5e98e21b8c81166d3ed0