Implemented the PrefabViewportFocusPathHandler class, added a breadcrumb widget to the viewport toolbar to display the currently focused prefab path.

Signed-off-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabFocusInterface.h

@@ -28,6 +28,10 @@ namespace AzToolsFramework::Prefab
         //! @param entityId The entityId of the entity whose owning instance we want the prefab system to focus on.
         virtual PrefabFocusOperationResult FocusOnOwningPrefab(AZ::EntityId entityId) = 0;
 
+        //! Set the focused prefab instance to the instance at position index of the current path.
+        //! @param index The index of the instance in the current path that we want the prefab system to focus on.
+        virtual PrefabFocusOperationResult FocusOnPathIndex(int index) = 0;
+
         //! Returns the template id of the instance the prefab system is focusing on.
         virtual TemplateId GetFocusedPrefabTemplateId() = 0;
 
@@ -38,6 +42,11 @@ namespace AzToolsFramework::Prefab
         //! @param entityId The entityId of the queried entity.
         //! @return true if the entity belongs to the focused instance or one of its descendants, false otherwise.
         virtual bool IsOwningPrefabBeingFocused(AZ::EntityId entityId) = 0;
+
+        //! Returns whether the entity belongs to the instance that is being focused on, or one of its descendants.
+        //! @param entityId The entityId of the queried entity.
+        //! @return true if the entity belongs to the focused instance or one of its descendants, false otherwise.
+        virtual const AZ::IO::Path& GetPrefabFocusPath() = 0;
     };
 
 } // namespace AzToolsFramework::Prefab