Wave enemies (#9)

* Add enemy wave management and path following components

* cleanup

scripts/components/PathFollowerComponent.cs

@@ -0,0 +1,67 @@
+using Godot;
+
+namespace Mr.BrickAdventures.scripts.components;
+
+[GlobalClass]
+public partial class PathFollowerComponent : Node2D
+{
+    [Export] public float Speed { get; set; } = 200f;
+    [Export] public bool ShouldRotate { get; set; } = true;
+
+    private PathFollow2D _pathFollowNode;
+    private HealthComponent _healthComponent;
+    private bool _isActive = false;
+
+    [Signal]
+    public delegate void PathCompletedEventHandler();
+    [Signal]
+    public delegate void EnemyDestroyedEventHandler();
+    
+    public override void _Ready()
+    {
+        _healthComponent = GetOwner().GetNodeOrNull<HealthComponent>("HealthComponent");
+        if (_healthComponent != null)
+        {
+            _healthComponent.Death += OnDeath;
+        }
+    }
+    
+    public override void _Process(double delta)
+    {
+        if (!_isActive || _pathFollowNode == null) return;
+        
+        _pathFollowNode.Progress += Speed * (float)delta;
+        
+        if (_pathFollowNode.ProgressRatio >= 1.0f)
+        {
+            _isActive = false;
+            EmitSignalPathCompleted();
+            _pathFollowNode.QueueFree();
+        }
+    }
+
+    public void Initialize(PathFollow2D pathFollowNode)
+    {
+        _pathFollowNode = pathFollowNode;
+        if (ShouldRotate)
+        {
+            _pathFollowNode.Rotates = true;
+        }
+        else
+        {
+            _pathFollowNode.Rotates = false;
+        }
+
+        _pathFollowNode.Loop = false;
+    }
+
+    public void StartFollowing()
+    {
+        _isActive = true;
+    }
+
+    private void OnDeath()
+    {
+        EmitSignalEnemyDestroyed();
+    }
+}