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.

resources/sounds/effect/Rip.wav.import

@@ -0,0 +1,24 @@
+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://bx3n11awokuyd"
+path="res://.godot/imported/Rip.wav-252d78561730eebe258400cdc7225903.sample"
+
+[deps]
+
+source_file="res://resources/sounds/effect/Rip.wav"
+dest_files=["res://.godot/imported/Rip.wav-252d78561730eebe258400cdc7225903.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0