Handle Physics2D module

Runtime/GameplayIngredients.asmdef

 {
     "name": "GameplayIngredients",
+    "rootNamespace": "",
     "references": [
         "NaughtyAttributes.Core",
         "Cinemachine",
     "precompiledReferences": [],
     "autoReferenced": true,
     "defineConstraints": [],
-    "versionDefines": [],
+    "versionDefines": [
+        {
+            "name": "com.unity.modules.physics2d",
+            "expression": "1.0.0",
+            "define": "MODULE_PHYSICS2D"
+        }
+    ],
     "noEngineReferences": false
 }

Runtime/LevelScripting/Events/OnCollider2DEvent.cs

-using NaughtyAttributes;
+#if MODULE_PHYSICS2D
+using NaughtyAttributes;
 using UnityEngine;
 
 namespace GameplayIngredients.Events
         }
     }
 }
+#endif

Runtime/LevelScripting/Events/OnTrigger2DEvent.cs

+#if MODULE_PHYSICS2D
 using NaughtyAttributes;
 using UnityEngine;
 
         }
     }
 }
+#endif