feat(*): Add self-play RL training pipeline with PPO trainer, in-game GDScript policy inference, and bot opponent support in Match mode

Game/project.godot

@@ -21,6 +21,10 @@ run/main_scene="uid://bcq14356s3e2i"
 config/features=PackedStringArray("4.7", "Forward Plus")
 config/icon="res://icon.svg"
 
+[editor_plugins]
+
+enabled=PackedStringArray("res://addons/godot_rl_agents/plugin.cfg")
+
 [display]
 
 window/size/viewport_width=1920
@@ -114,3 +118,4 @@ roll_right={
 
 
 
+