Fix android crashes

[aguycalled]

This Pull Request fixes two crashes in Android 10.x:

• When showing BlurView when the app gets locked after going to background. Solution: Using an opaque View.
• When BlurView is shown while a screen change animation happens. Solution: Wrapping the BlurView in BlurViewContainer delaying its appearance until the animation is finished. Source: https://github.com/Kureev/react-native-blur/issues/452#issuecomment-1092845638
• When using Biometrics to access the secrets. Solution: Use react-native-fingerprint-scanner instead of expo-local-authentication.