Make methods in GameObjectCreatorFromMetadata virtual

[jessicafalk]

Description

To allow developers to modify the default pipeline for creating and destroying linked game objects, we should make the add a filter method in the GameObjectCreatorFromMetadata and make it virtual. This allows you to add your own custom logic on top of it by inheriting from the class and overriding that one method.

[jamiebrynes7]

cc @filod you can follow this issue to track the FR 😄