feat: IEntity.Id & BaseEntity

Engine.Core/Abstract/IEntity.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -5,4 +7,14 @@ namespace Syntriax.Engine.Core.Abstract;
 /// </summary>
 public interface IEntity : IInitialize, IAssignableStateEnable
 {
+    /// <summary>
+    /// Event triggered when the <see cref="Id"/> of the <see cref="IEntity"/> changes.
+    /// The string action parameter is the previous <see cref="Id"/> of the <see cref="IEntity"/>. 
+    /// </summary>
+    Action<IEntity, string>? OnIdChanged { get; set; }
+
+    /// <summary>
+    /// The ID of the <see cref="IEntity"/>.
+    /// </summary>
+    string Id { get; set; }
 }