feat: Added Inventory and Item components

- Moved input tests into nested module
- Added inventory tests

src/inventory/mod.rs

@@ -0,0 +1,39 @@
+use bevy::prelude::*;
+
+pub mod item;
+
+#[derive(Component)]
+pub struct Inventory {
+    pub size: UVec2,
+}
+
+impl Inventory {
+    pub fn new(size: UVec2) -> Self {
+        Self { size }
+    }
+
+    pub fn can_fit(
+        &self,
+        item_query: Query<&item::Item>,
+        contained_items: &Children,
+        queried_size: UVec2,
+        queried_position: UVec2,
+    ) -> bool {
+        let item_corner = queried_size + queried_position;
+        if item_corner.x > self.size.x || item_corner.y > self.size.y {
+            return false;
+        }
+
+        for entity in contained_items {
+            let Ok(item) = item_query.get(*entity) else {
+                warn!("Could not query inventory child ({entity}), probably not item?");
+                continue;
+            };
+            
+            if item.overlaps(queried_size, queried_position) {
+                return false;
+            }
+        }
+        true
+    }
+}