feat: add MC 1.21.9/1.21.10 (protocol 773) version constants and enum values

Register protocol 773 for Minecraft 1.21.9 and 1.21.10 (which share the
same protocol as a hotfix release). Update MCHighestVersion to 1.21.10.

Add 49 new item types (copper tools/armor, shelves, copper chests,
copper golem statue variants, oxidized lightning rods, iron chain, etc.),
2 new entity types (CopperGolem, Mannequin), 38 new block materials,
3 new entity metadata serializer types (CopperGolemState,
WeatheringCopperState, ResolvableProfile), and 6 new packet types
(DebugBlockValue, DebugChunkValue, DebugEntityValue, DebugEvent,
GameTestHighlightPos, CodeOfConduct, AcceptCodeOfConduct).

Chain item/block renamed to IronChain in 1.21.9; old enum values
retained for backward compatibility with older palettes.

Made-with: Cursor

MinecraftClient/Mapping/EntityMetaDataType.cs

@@ -98,11 +98,23 @@ public enum EntityMetaDataType
     /// </summary>
     ArmadilloState,
     /// <summary>
+    /// VarInt (1.21.9+)
+    /// </summary>
+    CopperGolemState,
+    /// <summary>
+    /// VarInt (1.21.9+)
+    /// </summary>
+    WeatheringCopperState,
+    /// <summary>
     /// Float x3
     /// </summary>
     Vector3,
     /// <summary>
     /// Float x4
     /// </summary>
-    Quaternion
+    Quaternion,
+    /// <summary>
+    /// Either&lt;GameProfile, Partial&gt; + PlayerSkin.Patch (1.21.9+)
+    /// </summary>
+    ResolvableProfile
 }