Merged PR 248: Make observation flattening optional for agents.

## Summary
Same as other PR but this time we are merging into DEV.

The Proxy agent has a new config option, `flatten_obs`. If true, we use gymnasium flatten.

## Test process
Unit tests and inspection.

Related work items: #2143, #2154, #2161

src/primaite/game/agent/interface.py

@@ -44,6 +44,8 @@ class AgentSettings(BaseModel):
 
     start_settings: Optional[AgentStartSettings] = None
     "Configuration for when an agent begins performing it's actions"
+    flatten_obs: bool = True
+    "Whether to flatten the observation space before passing it to the agent. True by default."
 
     @classmethod
     def from_config(cls, config: Optional[Dict]) -> "AgentSettings":
@@ -166,6 +168,7 @@ class ProxyAgent(AbstractAgent):
         action_space: Optional[ActionManager],
         observation_space: Optional[ObservationManager],
         reward_function: Optional[RewardFunction],
+        agent_settings: Optional[AgentSettings] = None,
     ) -> None:
         super().__init__(
             agent_name=agent_name,
@@ -174,6 +177,7 @@ class ProxyAgent(AbstractAgent):
             reward_function=reward_function,
         )
         self.most_recent_action: ActType
+        self.flatten_obs: bool = agent_settings.flatten_obs if agent_settings else False
 
     def get_action(self, obs: ObsType, reward: float = 0.0) -> Tuple[str, Dict]:
         """

src/primaite/game/game.py

@@ -432,6 +432,7 @@ class PrimaiteGame:
                     action_space=action_space,
                     observation_space=obs_space,
                     reward_function=rew_function,
+                    agent_settings=agent_settings,
                 )
                 game.agents.append(new_agent)
                 game.rl_agents.append(new_agent)