Move AddonArgs to it's own file

Dalamud/Plugin/Services/IAddonLifecycle.cs

@@ -2,8 +2,6 @@
 using System.Runtime.InteropServices;
 
 using Dalamud.Game.AddonLifecycle;
-using Dalamud.Memory;
-using FFXIVClientStructs.FFXIV.Component.GUI;
 
 namespace Dalamud.Plugin.Services;
 
@@ -79,22 +77,4 @@ public interface IAddonLifecycle
     /// </summary>
     /// <param name="handlers">Handlers to remove.</param>
     void UnregisterListener(params AddonEventDelegate[] handlers);
-    
-    /// <summary>
-    /// Addon argument data for use in event subscribers.
-    /// </summary>
-    public unsafe class AddonArgs
-    {
-        private string? addonName;
-        
-        /// <summary>
-        /// Gets the name of the addon this args referrers to.
-        /// </summary>
-        public string AddonName => this.Addon == nint.Zero ? "NullAddon" : this.addonName ??= MemoryHelper.ReadString((nint)((AtkUnitBase*)this.Addon)->Name, 0x20);
-
-        /// <summary>
-        /// Gets the pointer to the addons AtkUnitBase.
-        /// </summary>
-        required public nint Addon { get; init; }
-    }
 }