fix(#234): cache get_next_feed result to avoid repeated datetime computations (#247)

Co-authored-by: Jamie Jones <29973406+jjjonesjr33@users.noreply.github.com>

Author: dennismdejong

custom_components/petlibro/devices/feeders/granary_smart_feeder.py

@@ -16,9 +16,11 @@ def __init__(self, *args, **kwargs):
         """Initialize the feeder with default values."""
         super().__init__(*args, **kwargs)
         self._manual_feed_quantity = None  # Default to None initially
+        self._cached_get_next_feed = None
 
     async def refresh(self):
         """Refresh the device data from the API."""
+        self._cached_get_next_feed = None
         try:
             await super().refresh()  # Call the refresh method from Device
 
@@ -285,6 +287,8 @@ def get_next_feed(self) -> dict:
                 "utc_time": datetime,
             }
         """
+        if self._cached_get_next_feed is not None:
+            return self._cached_get_next_feed
         now_utc = dt_util.now(dt_util.UTC)
         next_feed = {}
 
@@ -323,6 +327,7 @@ def get_next_feed(self) -> dict:
                         "id": feed["id"],
                         "utc_time": candidate_dt_utc,
                     }
+        self._cached_get_next_feed = next_feed
         return next_feed
 
     @property