Feat: Implement belief collector

[
    - Currently implements belief collection from text-based mock agent.
    - The beliefs communicated by this agent look like this:

        {
            "type": "belief_extraction_text",
            "beliefs": [
                {"user_said": [["hello"],["Can you help me?"],["stop talking to me"],["No"],["Pepper do a dance"]]}
            ]
        }
    * have yet to add tests (but we want to merge into Dev. asap)
]

[ref]: N25B-206

src/control_backend/agents/mock_agents/belief_text_mock.py

@@ -0,0 +1,31 @@
+import json
+from spade.agent import Agent
+from spade.behaviour import OneShotBehaviour
+from spade.message import Message
+from control_backend.core.config import settings
+
+class BeliefTextAgent(Agent):
+    class SendOnceBehaviourBlfText(OneShotBehaviour):
+        async def run(self):
+            to_jid = f"{settings.agent_settings.belief_collector_agent_name}@{settings.agent_settings.host}"
+
+            # Send multiple beliefs in one JSON payload
+            payload = {
+                "type": "belief_extraction_text",
+                "beliefs": [
+                    {"user_said": [["hello"],["Can you help me?"],["stop talking to me"],["No"],["Pepper do a dance"]]}
+                ]
+            }
+
+            msg = Message(to=to_jid)
+            msg.body = json.dumps(payload)
+            await self.send(msg)
+            print(f"Beliefs sent to {to_jid}!")
+
+            self.exit_code = "Job Finished!"
+            await self.agent.stop()
+
+    async def setup(self):
+        print("BeliefTextAgent started")
+        self.b = self.SendOnceBehaviourBlfText()
+        self.add_behaviour(self.b)