feat: implement collision detection system for entities

src/entity/item.rs

@@ -1,6 +1,6 @@
 use crate::{
     constants,
-    entity::graph::Graph,
+    entity::{collision::Collidable, graph::Graph},
     error::EntityError,
     texture::sprite::{Sprite, SpriteAtlas},
 };
@@ -93,3 +93,9 @@ impl Item {
         }
     }
 }
+
+impl Collidable for Item {
+    fn position(&self) -> crate::entity::traversal::Position {
+        crate::entity::traversal::Position::AtNode(self.node_index)
+    }
+}