Testing: add a small Addressable build including scenes

The TestCommon folder has reference built content that is used for testing, we are still playing "catch up" because the testing coverage is still spotty for all the different build pipelines and variations that UnityDataTool covers.

Currently there is no reference AssetBundles that are built by Addressables so testing of that case has only happened in adhoc fashion, e.g. with large projects. Its primarily Analyze that is of concern - the dump, archive and serialized-file commands are generalized enough that they are unlikely to have bugs specific to Addressables.

The "Scene" case is a particular special case and required fixing because it wasn't properly handled by Analyze (issue #81). So any reference content should include at least one AssetBundle containing scenes.

Inizia nella cartella TestCommon esaminando il contenuto di riferimento già compilato e il modo in cui Analyze lo utilizza. Crea un piccolo Addressables AssetBundle che includa almeno una scena, quindi verifica che eserciti la copertura di Analyze per il caso della scena descritto in issue #81.