Add logged_duration context manager for profiling.

game/profiling.py

@@ -0,0 +1,13 @@
+import logging
+import timeit
+from contextlib import contextmanager
+from datetime import timedelta
+from typing import Iterator
+
+
+@contextmanager
+def logged_duration(event: str) -> Iterator[None]:
+    start = timeit.default_timer()
+    yield
+    end = timeit.default_timer()
+    logging.debug("%s took %s", event, timedelta(seconds=end - start))