Handle network offline state

[zaniluca]

Summary

Handle the offline state by not performing certain tasks and letting the user know he's offline

Todo / ordered steps

• Add expo-network
• Create a useNetworkState() hook that returns a boolean isOnline
• Inside the App.tsx add a useEffect that checks for isOnline and eventually displays a toast letting the user know he's not online and tho he can't access the latest notifications
• Disable the queries if the user is offline to not make them wait till the timeout

Possible impacts / side effects on existing features

• Whole application

Additional notes

Expo Network: https://docs.expo.dev/versions/latest/sdk/network/