[FIX] fastapi: Graceful shutdown of event loop

On server shutdown, ensure that created the event loops are closed properly.

Author: lmignon

fastapi/pools/__init__.py

@@ -1,7 +1,11 @@
 from .event_loop import EventLoopPool
 from .fastapi_app import FastApiAppPool
+from odoo.service.server import CommonServer
 
 event_loop_pool = EventLoopPool()
 fastapi_app_pool = FastApiAppPool()
 
+
+CommonServer.on_stop(event_loop_pool.shutdown)
+
 __all__ = ["event_loop_pool", "fastapi_app_pool"]