feat: 添加蘑菇矿挖爪武器及其相关功能

添加新的武器蘑菇矿挖爪，包括武器脚本、子弹脚本和场景文件。修改BulletBase.gd以支持新武器的功能，并在Rooster角色中添加该武器。同时设置rooster节点为初始不可见状态。

- 新增MushroomPickaxe武器，具有概率掉落物品的特性
- 修改BulletBase的succeedToHit方法以支持实体参数
- 在Rooster场景中添加新武器
- 设置rooster节点的currentInvinsible属性为true

scripts/Contents/Bullets/MushroomPickaxe.gd

@@ -0,0 +1,14 @@
+extends BulletBase
+class_name MushroomPickaxe
+
+var count: int = 2
+var rate: float = 0.1
+
+func succeedToHit(_dmg, entity):
+	if MathTool.rate(rate):
+		for i in randi_range(1, count):
+			ItemDropped.generate(
+				MathTool.randc_from([ItemStore.ItemType.BASEBALL, ItemStore.ItemType.BASKETBALL, ItemStore.ItemType.BEACHBALL]),
+				randi_range(1, count),
+				entity.position + MathTool.randv2_range(GameRule.itemDroppedSpawnOffset)
+			)

scripts/Contents/Weapons/MushroomPickaxe.gd

@@ -0,0 +1,16 @@
+@tool
+extends Weapon
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 0.5 * to
+	origin["rate"] += 0.02 * to
+	origin["count"] += 1 * level
+	return origin
+func attack(entity: EntityBase):
+	var weaponPos = entity.findWeaponAnchor("normal")
+	for j in BulletBase.generate(preload("res://components/Bullets/MushroomPickaxe.tscn"), entity, entity.texture.global_position, weaponPos.angle_to_point(get_global_mouse_position())):
+		var bullet: MushroomPickaxe = j
+		bullet.damage = readStore("atk")
+		bullet.rate = readStore("rate")
+		bullet.count = readStore("count")
+	return true