Added ability to convert multiply-nested slices (#1239)

* Addressed feedback from previous PR
* Change missing entity aliases to be deterministic.
When converting slices, this helps produce the same results on multiple reconversions of the same data.
* Exposed the asset filter callback.
This allows the slice converter to specifically load nested slices as opposed to not loading *any* referenced assets.
* Added support for multiply-nested slice instance conversion.

Code/Tools/SerializeContextTools/Utilities.h

@@ -39,7 +39,11 @@ namespace AZ
 
             static AZStd::vector<AZ::Uuid> GetSystemComponents(const Application& application);
 
-            static bool InspectSerializedFile(const char* filePath, SerializeContext* sc, const ObjectStream::ClassReadyCB& classCallback);
+            static bool InspectSerializedFile(
+                const char* filePath,
+                SerializeContext* sc,
+                const ObjectStream::ClassReadyCB& classCallback,
+                Data::AssetFilterCB assetFilterCallback = AZ::Data::AssetFilterNoAssetLoading);
 
         private:
             Utilities() = delete;