add utils class for getting command paths

src/Discord.Net.Interactions/Utilities/CommandHierarchy.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+
+namespace Discord.Interactions
+{
+    internal static class CommandHierarchy
+    {
+        public const char EscapeChar = '$';
+
+        public static IList<string> GetModulePath(this ModuleInfo moduleInfo)
+        {
+            var result = new List<string>();
+
+            var current = moduleInfo;
+            while (current is not null)
+            {
+                if (current.IsSlashGroup)
+                    result.Insert(0, current.SlashGroupName);
+
+                current = current.Parent;
+            }
+
+            return result;
+        }
+
+        public static IList<string> GetCommandPath(this ICommandInfo commandInfo)
+        {
+            if (commandInfo.IgnoreGroupNames)
+                return new string[] { commandInfo.Name };
+
+            var path = commandInfo.Module.GetModulePath();
+            path.Insert(0, commandInfo.Name);
+            return path;
+        }
+
+        public static IList<string> GetParameterPath(this IParameterInfo parameterInfo)
+        {
+            var path = parameterInfo.Command.GetCommandPath();
+            path.Insert(0, parameterInfo.Name);
+            return path;
+        }
+
+        public static IList<string> GetChoicePath(this IParameterInfo parameterInfo, ParameterChoice choice)
+        {
+            var path = parameterInfo.GetParameterPath();
+            path.Insert(0, choice.Name);
+            return path;
+        }
+
+        public static IList<string> GetTypePath(Type type) =>
+            new string[] { EscapeChar + type.FullName };
+    }
+}