Merged PR 401: 2628 update benchmark script

## Summary
Updated the benchmark script so that it's compatible with PrimAITE v3.0.0

Chris also ran the benchmark and included the results

the script should also now work via cli (`python ./benchmark/primaite_benchmark.py`)

## Test process
n/a

## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [ ] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [ ] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code

Related work items: #2628

src/primaite/VERSION

@@ -1 +1 @@
-3.0.0b9
+3.0.0

src/primaite/session/environment.py

@@ -37,6 +37,8 @@ class PrimaiteGymEnv(gymnasium.Env):
         """Name of the RL agent. Since there should only be one RL agent we can just pull the first and only key."""
         self.episode_counter: int = 0
         """Current episode number."""
+        self.average_reward_per_episode: Dict[int, float] = {}
+        """Average rewards of agents per episode."""
 
     @property
     def agent(self) -> ProxyAgent:
@@ -89,6 +91,8 @@ class PrimaiteGymEnv(gymnasium.Env):
             f"Resetting environment, episode {self.episode_counter}, "
             f"avg. reward: {self.agent.reward_function.total_reward}"
         )
+        self.average_reward_per_episode[self.episode_counter] = self.agent.reward_function.total_reward
+
         if self.io.settings.save_agent_actions:
             all_agent_actions = {name: agent.history for name, agent in self.game.agents.items()}
             self.io.write_agent_log(agent_actions=all_agent_actions, episode=self.episode_counter)