Report move to display for activities that handle config changes

When activity that is moved between displays handles all configuration
changes, it won't be restarted. This CL adds a callback to the client
to notify it about display change. Usually it will be followed by
onConfigurationChanged, except when configuration didn't actually change.
When activity is recreated, it won't receive onMovedToDisplay.

Bug: 34862802
Test: android.server.cts.ActivityManagerDisplayTests
Test: #testOnMovedToDisplayCallback
Change-Id: I9a9501cab788623ada15a31efb53e4b2378639fe