Add end effector action space to hil-serl (#861)

Co-authored-by: Adil Zouitine <adilzouitinegm@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

lerobot/common/envs/factory.py

@@ -135,6 +135,7 @@ class PixelWrapper(gym.Wrapper):
         return self._get_obs(obs), reward, terminated, truncated, info
 
 
+# TODO: Remove this
 class ConvertToLeRobotEnv(gym.Wrapper):
     def __init__(self, env, num_envs):
         super().__init__(env)