fix: add EntityMetadataPalette1206 for correct 1.20.6+ entity metadata parsing

1.20.6 introduced three new EntityDataSerializer types compared to 1.20.4:
- PARTICLES (id 18) - list of particles, inserted after PARTICLE
- WOLF_VARIANT (id 23) - wolf variant holder, inserted after CAT_VARIANT
- ARMADILLO_STATE (id 28) - armadillo state, inserted after SNIFFER_STATE

These insertions shifted subsequent serializer IDs, causing the 1.19.4
palette (EntityMetadataPalette1194) to misidentify metadata types on
1.20.6+ servers. This could lead to incorrect byte consumption and
potential packet parse failures when entities with affected metadata
types (e.g. wolves, armadillos, area effect clouds with particles)
were present.

Changes:
- Add Particles, WolfVariant, ArmadilloState to EntityMetaDataType enum
- Create EntityMetadataPalette1206 with correct 31-entry ID mapping
- Route 1.20.6+ to the new palette in EntityMetadataPalette.GetPalette()
- Add read logic for the three new types in DataTypes.cs

Verified on 1.21.1 vanilla server: cat, wolf, frog, armadillo, painting
entities all spawn without metadata parse errors.

Made-with: Cursor

MinecraftClient/Mapping/EntityMetaDataType.cs

@@ -36,6 +36,10 @@ public enum EntityMetaDataType
     Nbt,
     Particle,
     /// <summary>
+    /// List of Particle (1.20.6+)
+    /// </summary>
+    Particles,
+    /// <summary>
     /// VarInt x3
     /// </summary>
     VillagerData,
@@ -48,6 +52,10 @@ public enum EntityMetaDataType
     /// VarInt
     /// </summary>
     CatVariant,
+    /// <summary>
+    /// VarInt (1.20.6+)
+    /// </summary>
+    WolfVariant,
     FrogVariant,
     /// <summary>
     /// String + Position
@@ -66,6 +74,10 @@ public enum EntityMetaDataType
     /// </summary>
     SnifferState,
     /// <summary>
+    /// VarInt (1.20.6+)
+    /// </summary>
+    ArmadilloState,
+    /// <summary>
     /// Float x3
     /// </summary>
     Vector3,