Morphology/brittle star 2 arms (#17)

Provide the features to read in Environment (Morphology, arena, ...) config files in the JSON format. The example JSON file contains the config for a brittle star with 2 arms

src/brittle_star_project/dataclasses/PPOArgs.py

@@ -7,6 +7,9 @@ class PPOArgs:
     source: https://github.com/vwxyzjn/cleanrl/blob/master/cleanrl/ppo_atari_envpool_xla_jax_scan.py
     """
 
+    # path to environment config file, if None, use default config
+    config_path: str | None = None
+
     # the name of this experiment
     exp_name: str = "brittle_star_ppo"
 
@@ -41,8 +44,6 @@ class PPOArgs:
     hf_entity: str = ""
 
     # ==== Algorithm specific dataclasses ====
-    # the id of the environment
-    env_id: str = ""  # todo
 
     # total timesteps of the experiments
     total_timesteps: int = 10000000
@@ -51,7 +52,7 @@ class PPOArgs:
     learning_rate: float = 2.5e-4
 
     # the number of parallel game environments
-    num_envs: int = 16
+    num_envs: int = 100
 
     # the number of steps to run in each environment per policy rollout
     num_steps: int = 128