refactor: agents inherit logger from BaseAgent

Created a class `BaseAgent`, from which all agents inherit. They get
assigned a logger with a nice name (something like
`control_backend.agents.AgentName`).

The BDI core takes care of its own logger, as bdi is still a module.

ref: N25B-241

src/control_backend/agents/base.py

@@ -0,0 +1,18 @@
+import logging
+
+from spade.agent import Agent
+
+
+class BaseAgent(Agent):
+    """
+    Base agent class for our agents to inherit from.
+    This ensures that all agents have a logger.
+    """
+
+    logger: logging.Logger
+
+    # Whenever a subclass is initiated, give it the correct logger
+    def __init_subclass__(cls, **kwargs) -> None:
+        super().__init_subclass__(**kwargs)
+
+        cls.logger = logging.getLogger(__package__).getChild(cls.__name__)