Add more tracing for turn processing.

Most of the time (1-2 seconds) is going to flight plan layout. There
don't seem to be any easy opportunities for improvement.

game/profiling.py

@@ -1,5 +1,8 @@
+from __future__ import annotations
+
 import logging
 import timeit
+from collections import defaultdict
 from contextlib import contextmanager
 from datetime import timedelta
 from typing import Iterator
@@ -11,3 +14,22 @@ def logged_duration(event: str) -> Iterator[None]:
     yield
     end = timeit.default_timer()
     logging.debug("%s took %s", event, timedelta(seconds=end - start))
+
+
+class MultiEventTracer:
+    def __init__(self) -> None:
+        self.events: dict[str, timedelta] = defaultdict(timedelta)
+
+    def __enter__(self) -> MultiEventTracer:
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb) -> None:
+        for event, duration in self.events.items():
+            logging.debug("%s took %s", event, duration)
+
+    @contextmanager
+    def trace(self, event: str) -> Iterator[None]:
+        start = timeit.default_timer()
+        yield
+        end = timeit.default_timer()
+        self.events[event] += timedelta(seconds=end - start)