fix: resolve entity tracking, container interaction, and enchantment mapping issues for 1.21

- SpawnEntity packet handler now registers non-player entities via OnSpawnEntity
  for protocol >= 1.20.2 (previously only players were tracked, causing 'entity near'
  to find nothing)
- PlaceBlock gains lookAtBlock option that sends a position/rotation update before the
  block placement packet, fixing containers not opening via useblock
- Enchantment registry IDs are now dynamically parsed from server RegistryData
  (minecraft:enchantment), fixing incorrect enchantment name display in 1.21
- AttributeModifiersComponent uses base SubComponent type to avoid InvalidCastException
  when parsing 1.21-specific attribute subcomponents

Made-with: Cursor

MinecraftClient/Commands/Useblock.cs

@@ -1,4 +1,4 @@
-using Brigadier.NET;
+using Brigadier.NET;
 using Brigadier.NET.Builder;
 using MinecraftClient.CommandHandler;
 using MinecraftClient.Mapping;
@@ -48,7 +48,7 @@ namespace MinecraftClient.Commands
             Location current = handler.GetCurrentLocation();
             block = block.ToAbsolute(current).ToFloor();
             Location blockCenter = block.ToCenter();
-            bool res = handler.PlaceBlock(block, Direction.Down);
+            bool res = handler.PlaceBlock(block, Direction.Down, lookAtBlock: true);
             return r.SetAndReturn(string.Format(Translations.cmd_useblock_use, blockCenter.X, blockCenter.Y, blockCenter.Z, res ? "succeeded" : "failed"), res);
         }
     }