feat: Add weapon system and attack functionality to Rooster character

- Introduced a weapons node in EntityBase for weapon management.
- Updated Rooster to include cooldown for attacks and weapon anchoring.
- Implemented attack method in Rooster to generate bullets.
- Enhanced BulletBase with life distance and lifetime properties.
- Created Chick character with animations and integrated into the world.
- Updated PurpleCrystal bullet behavior to move forward based on rotation.
- Refactored EntityBase to use a fields dictionary for attributes.
- Added FieldStore for managing entity-related constants.
- Adjusted GameRule to include bullet speed multiplier.

scripts/Tools/GameRule.gd

@@ -1,3 +1,4 @@
 class_name GameRule
 
-static var allowFriendlyFire: bool = false # 是否允许友军伤害
+static var allowFriendlyFire: bool = false # 是否允许友军伤害
+static var bulletSpeedMultiplier: float = 1 # 子弹速度倍率