Refactor iOS dependencies and update HealthKit integration

- Removed NitroModules and ReactNativeHealthkit from Podfile.lock and package files.
- Updated Info.plist to increment app version from 2 to 3.
- Refactored background task manager to define background tasks within the class.
- Added new utility file for sleep data management, including fetching sleep samples, calculating sleep statistics, and generating sleep quality scores.

app.json

@@ -84,10 +84,7 @@
         }
       ],
       [
-        "expo-background-task",
-        {
-          "minimumInterval": 15
-        }
+        "expo-background-task"
       ]
     ],
     "experiments": {