feat: protocol 767 (1.21) packet handling and AttributeSubComponent update

- Add AttributeSubComponent121 that uses ResourceLocation(string) instead
  of UUID+Name, matching the 1.21 attribute modifier wire format change.
  Register it in SubComponentRegistry121 via new ReplaceSubComponent method.
- Add ProjectilePower packet handler: reads 1 double (accelerationPower)
  for 1.21+, or 3 doubles (xPower/yPower/zPower) for 1.20.6.
- Add CustomReportDetails and ServerLinks packet handlers in both Play
  and Configuration phases, consuming all fields to prevent byte offset
  errors on 1.21 servers.

Made-with: Cursor

MinecraftClient/Protocol/Handlers/StructuredComponents/Components/Subcomponents/1_21/AttributeSubComponent121.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using MinecraftClient.Protocol.Handlers.StructuredComponents.Core;
+
+namespace MinecraftClient.Protocol.Handlers.StructuredComponents.Components.Subcomponents._1_21;
+
+public class AttributeSubComponent121(DataTypes dataTypes, SubComponentRegistry subComponentRegistry) : SubComponent(dataTypes, subComponentRegistry)
+{
+    public int TypeId { get; set; }
+    public string? ResourceLocation { get; set; }
+    public double Value { get; set; }
+    public int Operation { get; set; }
+    public int Slot { get; set; }
+    
+    protected override void Parse(Queue<byte> data)
+    {
+        TypeId = dataTypes.ReadNextVarInt(data);
+        ResourceLocation = dataTypes.ReadNextString(data);
+        Value = dataTypes.ReadNextDouble(data);
+        Operation = dataTypes.ReadNextVarInt(data);
+        Slot = dataTypes.ReadNextVarInt(data);
+    }
+
+    public override Queue<byte> Serialize()
+    {
+        var data = new List<byte>();
+        data.AddRange(DataTypes.GetVarInt(TypeId));
+        
+        if (string.IsNullOrEmpty(ResourceLocation?.Trim()))
+            throw new ArgumentNullException($"Can not serialize AttributeSubComponent121 due to ResourceLocation being null or empty!");
+        
+        data.AddRange(DataTypes.GetString(ResourceLocation));
+        data.AddRange(DataTypes.GetDouble(Value));
+        data.AddRange(DataTypes.GetVarInt(Operation));
+        data.AddRange(DataTypes.GetVarInt(Slot));
+        return new Queue<byte>(data);
+    }
+}