feat: added IIdentifiable comparison interface & IsIdentical extension method

Engine.Core/Abstract/IIdentifiable.cs

@@ -3,7 +3,7 @@ namespace Engine.Core;
 /// <summary>
 /// Represents any instance in the engine with an id.
 /// </summary>
-public interface IIdentifiable
+public interface IIdentifiable : System.IComparable<IIdentifiable>
 {
     /// <summary>
     /// Event triggered when the <see cref="Id"/> of the <see cref="IIdentifiable"/> changes.

Engine.Core/BaseEntity.cs

@@ -101,4 +101,6 @@ public abstract class BaseEntity : IEntity
 
     protected BaseEntity() => Id = Guid.NewGuid().ToString("D");
     protected BaseEntity(string id) => Id = id;
+
+    public int CompareTo(IIdentifiable? other) => Id.CompareTo(other?.Id);
 }

Engine.Core/Extensions/IdentifiableExtensions.cs

@@ -0,0 +1,7 @@
+namespace Engine.Core;
+
+public static class IdentifiableExtensions
+{
+    public static bool IsIdentical(this IIdentifiable? left, IIdentifiable? right)
+        => left?.CompareTo(right) == 0;
+}