Add audio effect and implement FireScan bullet behavior

- Added Rip.wav audio effect to the project.
- Created FireScan bullet script with speed and damage properties.
- Implemented basic AI movement for FireScan bullets.
- Introduced Wave class for managing enemy waves with dynamic counts and spawning logic.

scripts/Contents/Bullets/FireScan.gd

@@ -0,0 +1,10 @@
+extends BulletBase
+class_name FireScan
+
+func _ready():
+	fields[FieldStore.Bullet.SPEED] = 5
+	fields[FieldStore.Bullet.DAMAGE] = 20
+	super._ready()
+
+func ai():
+	forward(Vector2.from_angle(rotation))