feat: add MC 1.21.5 (protocol 770) support

Full protocol adaptation for Minecraft 1.21.5:

- Protocol version mapping: 770 -> 1.21.5
- Packet palette: AddExperienceOrb removed (S2C), TestInstanceBlockStatus
  added (S2C), SetTestBlock and TestInstanceBlockAction added (C2S)
- Entity metadata palette: 5 new serializer types (OptionalLivingEntityReference,
  CowVariant, WolfSoundVariant, PigVariant, ChickenVariant), OPTIONAL_UUID
  replaced by OPTIONAL_LIVING_ENTITY_REFERENCE
- Item palette: 11 new items (Bush, FireflyBush, DryShortGrass, DryTallGrass,
  Wildflowers, LeafLitter, CactusFlower, TestBlock, TestInstanceBlock,
  BlueEgg, BrownEgg)
- Entity palette: Potion split into SplashPotion and LingeringPotion
- Block palette: 9 new blocks (bush, cactus_flower, firefly_bush, leaf_litter,
  short_dry_grass, tall_dry_grass, test_block, test_instance_block, wildflowers)
- Structured components: 31 new components including tooltip_display, weapon,
  blocks_attacks, potion_duration_scale, provides_trim_material,
  provides_banner_patterns, break_sound, and 25 entity variant components;
  unbreakable changed from Bool to Unit; instrument changed to EitherHolder

Made-with: Cursor

MinecraftClient/Protocol/ProtocolHandler.cs

@@ -154,7 +154,7 @@ namespace MinecraftClient.Protocol
             {
                 4, 5, 47, 107, 108, 109, 110, 210, 315, 316, 335, 338, 340, 393, 401, 404, 477, 480, 485, 490, 498, 573,
                 575, 578, 735, 736, 751, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768,
-                769
+                769, 770
             };
 
             if (Array.IndexOf(suppoertedVersionsProtocol18, protocolVersion) > -1)
@@ -358,6 +358,8 @@ namespace MinecraftClient.Protocol
                         return 768;
                     case "1.21.4":
                         return 769;
+                    case "1.21.5":
+                        return 770;
                     default:
                         return 0;
                 }
@@ -441,6 +443,7 @@ namespace MinecraftClient.Protocol
                 767 => "1.21",
                 768 => "1.21.2",
                 769 => "1.21.4",
+                770 => "1.21.5",
                 _ => "0.0"
             };
         }