fix(ProtoExport): 修正MessageTypeHandler属性格式和位置

统一ProtoBuffUnityHelper和ProtoBuffServerHelper中MessageTypeHandler属性的格式，将模块位移计算用括号明确优先级，并调整属性位置使其位于类定义之前

Author: AlianBlank

ProtoExport/ProtoBuffServerHelper.cs

@@ -69,8 +69,8 @@ public void Run(MessageInfoList messageInfoList, string outputPath, string names
                     }
                     else
                     {
-                        sb.AppendLine($"    [MessageTypeHandler({(messageInfoList.Module << 16) + operationCodeInfo.Opcode})]");
                         sb.AppendLine($"    public sealed class {operationCodeInfo.Name} : MessageObject, {operationCodeInfo.ParentClass}");
+                        sb.AppendLine($"\t[MessageTypeHandler((({messageInfoList.Module}) << 16) + {operationCodeInfo.Opcode})]");
                     }
 
                     sb.AppendLine("    {");

ProtoExport/ProtoBuffUnityHelper.cs

@@ -59,7 +59,7 @@ public void Run(MessageInfoList messageInfoList, string outputPath, string names
                     }
                     else
                     {
-                        sb.AppendLine($"\t[MessageTypeHandler({(messageInfoList.Module << 16) + operationCodeInfo.Opcode})]");
+                        sb.AppendLine($"\t[MessageTypeHandler((({messageInfoList.Module}) << 16) + {operationCodeInfo.Opcode})]");
                         sb.AppendLine($"\tpublic sealed class {operationCodeInfo.Name} : MessageObject, {operationCodeInfo.ParentClass}");
                     }