Auth state needs to be persisted with Local Storage

[Aidasvenc]

          Overall LGTM, I tested everything on my machine and my android. There is just a warning at launch, but it's not related to a screen but rather the firebase/auth package.

This warning does not prevent the app from functioning correctly, I suggest we address it in another PR.

Originally posted by @GaelCondeLosada in #71 (review)

[Aidasvenc]

You are initializing Firebase Auth for React Native without providing
AsyncStorage. Auth state will default to memory persistence and will not
persist between sessions. In order to persist auth state, install the package
"@react-native-async-storage/async-storage" and provide it to
initializeAuth:

import { initializeAuth, getReactNativePersistence } from 'firebase/auth'; import ReactNativeAsyncStorage from '@react-native-async-storage/async-storage'; const auth = initializeAuth(app, {persistence: getReactNativePersistence(ReactNativeAsyncStorage)});