[4/n] Implement restart confirmation dialog

Implements a confirmation dialog explaining the user
how the restart button works when an app is in Size
Compat Mode.

Fixes: 260220432
Test: Manual using `adb shell dumpsys activity service
      SystemUIService WMShell compatui restartDialogEnabled 1`
      Run `atest WMShellUnitTests:RestartDialogLayoutTest
           WMShellUnitTests:CompatUIControllerTest`

Change-Id: I781190e2f082b26b08c8275ad29defea7d46f5ba