feat: 1. 添加武器基础脚本

2. 添加武器基本resources
3. 武器碰撞 RangeArea 进入和退出检测
4. 添加 Hitbox 进行武器碰撞敌人区域（只是添加了，功能还没实现）
5. 武器冷却时间 weapon_base / CooldownTimer

resources/items/weapons/melee/punch/stats_punch_2.tres

@@ -0,0 +1,12 @@
+[gd_resource type="Resource" script_class="WeaponStats" format=3 uid="uid://c6a44r3a7jmyd"]
+
+[ext_resource type="Script" uid="uid://d3d6rctbb48mk" path="res://resources/items/weapons/weapon_stats.gd" id="1_ccedh"]
+
+[resource]
+script = ExtResource("1_ccedh")
+damage = 8.0
+accurary = 1.0
+cooldown = 1.2
+max_range = 180.0
+knockback = 1.0
+metadata/_custom_type_script = "uid://d3d6rctbb48mk"