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/EntityMetadataPalettes/EntityMetadataPalette1206.cs

@@ -0,0 +1,51 @@
+using System.Collections.Generic;
+
+namespace MinecraftClient.Mapping.EntityMetadataPalettes;
+
+/// <summary>
+/// For 1.20.6+
+/// Added PARTICLES (id 18), WOLF_VARIANT (id 23), ARMADILLO_STATE (id 28)
+/// compared to 1.19.4 palette.
+/// </summary>
+public class EntityMetadataPalette1206 : EntityMetadataPalette
+{
+    private readonly Dictionary<int, EntityMetaDataType> entityMetadataMappings = new()
+    {
+        { 0, EntityMetaDataType.Byte },
+        { 1, EntityMetaDataType.VarInt },
+        { 2, EntityMetaDataType.VarLong },
+        { 3, EntityMetaDataType.Float },
+        { 4, EntityMetaDataType.String },
+        { 5, EntityMetaDataType.Chat },
+        { 6, EntityMetaDataType.OptionalChat },
+        { 7, EntityMetaDataType.Slot },
+        { 8, EntityMetaDataType.Boolean },
+        { 9, EntityMetaDataType.Rotation },
+        { 10, EntityMetaDataType.Position },
+        { 11, EntityMetaDataType.OptionalPosition },
+        { 12, EntityMetaDataType.Direction },
+        { 13, EntityMetaDataType.OptionalUuid },
+        { 14, EntityMetaDataType.BlockId },
+        { 15, EntityMetaDataType.OptionalBlockId },
+        { 16, EntityMetaDataType.Nbt },
+        { 17, EntityMetaDataType.Particle },
+        { 18, EntityMetaDataType.Particles },
+        { 19, EntityMetaDataType.VillagerData },
+        { 20, EntityMetaDataType.OptionalVarInt },
+        { 21, EntityMetaDataType.Pose },
+        { 22, EntityMetaDataType.CatVariant },
+        { 23, EntityMetaDataType.WolfVariant },
+        { 24, EntityMetaDataType.FrogVariant },
+        { 25, EntityMetaDataType.OptionalGlobalPosition },
+        { 26, EntityMetaDataType.PaintingVariant },
+        { 27, EntityMetaDataType.SnifferState },
+        { 28, EntityMetaDataType.ArmadilloState },
+        { 29, EntityMetaDataType.Vector3 },
+        { 30, EntityMetaDataType.Quaternion },
+    };
+
+    public override Dictionary<int, EntityMetaDataType> GetEntityMetadataMappingsList()
+    {
+        return entityMetadataMappings;
+    }
+}