Initial draft for save all prefabs workflow

Signed-off-by: srikappa-amzn <srikappa@amazon.com>

Code/Editor/Settings.h

@@ -18,6 +18,7 @@
 #include <QSettings>
 
 #include <AzToolsFramework/Editor/EditorSettingsAPIBus.h>
+#include <AzToolsFramework/Entity/PrefabEditorEntityOwnershipService.h>
 #include <AzCore/JSON/document.h>
 
 #include <AzQtComponents/Components/Widgets/ToolBar.h>
@@ -230,6 +231,11 @@ struct SSliceSettings
     bool dynamicByDefault;
 };
 
+struct SPrefabSettings
+{
+    AzToolsFramework::SavePrefabsPreference savePrefabsPreference;
+};
+
 //////////////////////////////////////////////////////////////////////////
 struct SAssetBrowserSettings
 {
@@ -466,8 +472,12 @@ AZ_POP_DISABLE_DLL_EXPORT_BASECLASS_WARNING
 
     SSliceSettings sliceSettings;
 
+    SPrefabSettings prefabSettings;
+
     bool prefabSystem = true;                  ///< Toggle to enable/disable the Prefab system for level entities.
 
+    void SetSavePrefabsPreference(AzToolsFramework::SavePrefabsPreference savePrefabsPreference);
+
 private:
     void SaveValue(const char* sSection, const char* sKey, int value);
     void SaveValue(const char* sSection, const char* sKey, const QColor& value);