add numpy version to timer metadata, log random seed (#4285)

ml-agents/mlagents/trainers/learn.py

     add_timer_metadata("mlagents_envs_version", mlagents_envs.__version__)
     add_timer_metadata("communication_protocol_version", UnityEnvironment.API_VERSION)
     add_timer_metadata("tensorflow_version", tf_utils.tf.__version__)
+    add_timer_metadata("numpy_version", np.__version__)
+        logger.info(f"run_seed set to {run_seed}")
     run_training(run_seed, options)