Add more extensive typing to openhands/core directory (#7728)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/core/loop.py

@@ -12,14 +12,14 @@ async def run_agent_until_done(
     runtime: Runtime,
     memory: Memory,
     end_states: list[AgentState],
-):
+) -> None:
     """
     run_agent_until_done takes a controller and a runtime, and will run
     the agent until it reaches a terminal state.
     Note that runtime must be connected before being passed in here.
     """
 
-    def status_callback(msg_type, msg_id, msg):
+    def status_callback(msg_type: str, msg_id: str, msg: str) -> None:
         if msg_type == 'error':
             logger.error(msg)
             if controller: