feat: implement stage transition for ghost eaten pause and add TimeToLive component

- `StageTransition` enum allows for collision system to apply state transition for ghost pausing.
- Added `TimeToLive` component & `time_to_live_system` to provide temporary sprite rendering of bonus sprites.
- Updated `stage_system` to handle the new ghost eaten pause state, including freezing entities and spawning bonus points.

src/texture/animated.rs

@@ -14,6 +14,11 @@ impl TileSequence {
         Self { tiles: tiles.to_vec() }
     }
 
+    /// Creates a tile sequence with a single tile.
+    pub fn single(tile: AtlasTile) -> Self {
+        Self { tiles: vec![tile] }
+    }
+
     /// Returns the tile at the given frame index, wrapping if necessary
     pub fn get_tile(&self, frame: usize) -> AtlasTile {
         if self.tiles.is_empty() {