fix(PPOTrainer.py, PPOArgs.py): added hyperparam config path to cli args, fixed missing arguments error in _step call

src/brittle_star_project/dataclasses/PPOArgs.py

@@ -13,6 +13,9 @@ class PPOArgs:
     # path to environment config file, if None, use default config
     env_config_path: str | None = None
 
+    # path to hyperparameter config file (yaml), if None, use default config
+    hyperparameter_config_path: str | None = None
+
     # the name of this experiment
     exp_name: str = "brittle_star_ppo"