add health component and FollowTarget Enemy Controller and minor changes

CharacterController/Enemy/FollowTargetEnemyController.gd

@@ -0,0 +1,17 @@
+class_name FollowTargetEnemyController extends SimpleEnemycontroller
+
+@export var target:Node2D
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	super._ready()
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	if target:
+		direction = sign(target.global_position.x - body.global_position.x )
+	else:
+		direction = 0
+
+	super._process(delta)