Convert ItemSize to prototypes (#21481)

* item sizes are prototypes

* eek

Content.Shared/Storage/StorageComponent.cs

@@ -5,6 +5,7 @@ using Robust.Shared.Audio;
 using Robust.Shared.Containers;
 using Robust.Shared.GameStates;
 using Robust.Shared.Map;
+using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.Storage
@@ -34,7 +35,7 @@ namespace Content.Shared.Storage
         /// </summary>
         [DataField, ViewVariables(VVAccess.ReadWrite), AutoNetworkedField]
         [Access(typeof(SharedStorageSystem))]
-        public ItemSize? MaxItemSize;
+        public ProtoId<ItemSizePrototype>? MaxItemSize;
 
         /// <summary>
         /// The max number of entities that can be inserted into this storage.