driver: return whether task queue is full in task_dispatcher()

pykirdy/driver/kirdy.py

@@ -759,7 +759,11 @@ class Kirdy:
             Enqueue a task to be handled by the handler.
         """
         if self.connected():
+            try:
                 self._task_queue.put_nowait(lambda: awaitable_fn)
+                return True
+            except asyncio.queues.QueueFull:
+                return False
         else:
             raise ConnectionError