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.

ios/digitalpilates/Info.plist

@@ -37,7 +37,7 @@
 		</dict>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>2</string>
+	<string>3</string>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
 	<key>LSMinimumSystemVersion</key>