feat: implemented damage to enemies

modules/wave_survival/hitbox.h

@@ -0,0 +1,22 @@
+#ifndef HITBOX_H
+#define HITBOX_H
+
+#include "scene/3d/physics/area_3d.h"
+class HealthStatus;
+
+class Hitbox : public Area3D {
+	GDCLASS(Hitbox, Area3D);
+	static void _bind_methods();
+
+public:
+	void set_health(HealthStatus *value);
+	HealthStatus *get_health() const;
+	void set_damage_modifier(float value);
+	float get_damage_modifier() const;
+
+private:
+	HealthStatus *health{ nullptr };
+	float damage_modifier{ 1.f };
+};
+
+#endif // !HITBOX_H