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/EntityMetadataPalette.cs

@@ -22,7 +22,8 @@ public abstract class EntityMetadataPalette
             <= Protocol18Handler.MC_1_12_2_Version => new EntityMetadataPalette1122(),  // 1.9 - 1.12.2
             <= Protocol18Handler.MC_1_19_2_Version => new EntityMetadataPalette1191(),  // 1.13 - 1.19.2
             <= Protocol18Handler.MC_1_19_3_Version => new EntityMetadataPalette1193(),  // 1.19.3
-            <= Protocol18Handler.MC_1_21_Version => new EntityMetadataPalette1194(),  // 1.19.4 - 1.21 +
+            < Protocol18Handler.MC_1_20_6_Version => new EntityMetadataPalette1194(),  // 1.19.4 - 1.20.4
+            <= Protocol18Handler.MC_1_21_Version => new EntityMetadataPalette1206(),  // 1.20.6 - 1.21
             _ => throw new NotImplementedException()
         };
     }