feat: add WildcardModRegistration and ModRegistration structs

CommandHook/ModRegistration.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+
+namespace CommandHook;
+
+public struct ModRegistration
+{
+    public readonly Dictionary<string, CommandRegistration> Commands;
+
+    public ModRegistration(Dictionary<string, CommandRegistration> commands)
+    {
+        Commands = commands;
+    }
+}

CommandHook/WildcardModRegistration.cs

@@ -0,0 +1,13 @@
+namespace CommandHook;
+
+public struct WildcardModRegistration
+{
+    public readonly CommandHookDelegate? Before;
+    public readonly CommandHookDelegate? After;
+
+    public WildcardModRegistration(CommandHookDelegate? before, CommandHookDelegate? after)
+    {
+        Before = before;
+        After = after;
+    }
+}