add Native AOT support for: ILinkRelation

Author: friflo

src/ECS/Base/NativeAOT.cs

@@ -188,6 +188,21 @@ public void RegisterRelation<T, TKey>()
             };
         }
     }
+    
+    public void RegisterLinkRelation<T>()
+        where T : struct, ILinkRelation
+    {
+        InitSchema();
+        if (typeSet.Add(typeof(T)))
+        {
+            AddType(typeof(T), SchemaTypeKind.Component);
+            RelationUtils.GetRelationKey<T,Entity>(default);        // dummy call to prevent trimming required type info
+            SchemaUtils.CreateRelationType<T>(0, null, null);       // dummy call to prevent trimming required type info
+            AbstractEntityRelations.CreateEntityRelationsNativeAot[typeof(T)] = (componentType, archetype, heap) => {
+                return new EntityLinkRelations<T>(componentType, archetype, heap);
+            };
+        }
+    }
 
     public void RegisterTag<T>()  where T : struct, ITag 
     {

src/Tests-NativeAOT/ECS/Test_NativeAOT.cs

@@ -88,7 +88,7 @@ public void Test_AOT_AddComponent_unknown()
             entity.AddComponent(new MyComponent2());    
         });
     }
-    
+#region IIndexedComponent<>
     [TestMethod]
     public void Test_AOT_IndexedComponents_class()
     {
@@ -161,8 +161,10 @@ public void Test_AOT_LinkComponents()
         entity3.DeleteEntity();                                         //   1     2
         entity2.HasComponent    <AttackComponent>();        // false
     }
-    
-    // [TestMethod] TODO
+#endregion
+
+#region IRelation<>
+    [TestMethod]
     public void Test_AOT_LinkRelations()
     {
         var store   = new EntityStore();
@@ -212,6 +214,7 @@ public void Test_AOT_Relations()
         entity.RemoveRelation<InventoryItem,InventoryItemType>(InventoryItemType.Axe);
         entity.GetRelations  <InventoryItem>();                       // { Coin }
     }
+    #endregion
 
     struct Player : IIndexedComponent<string>       // indexed field type: string
     {
@@ -249,7 +252,7 @@ private static EntitySchema CreateSchema()
             aot.RegisterIndexedComponentEntity<AttackComponent>();
 
             aot.RegisterRelation<InventoryItem, InventoryItemType>();
-
+            aot.RegisterLinkRelation<AttackRelation>();
 
             return schemaCreated = aot.CreateSchema();
         }