Save seed & birthday in keychain (IOS) keystore (Android)

[juanky201271]

on top of: #675

• Keystore (Android) - when you uninstall the App you lost the info inside of Keystore. With AES & CBC encryption or RSA encryption only available with Strong (level 3) Biometry method.
• Keychain (IOS) - when you uninstall the App the info inside of Keychain persist. With Standard IOS keychain encryption or using Secure Enclave only available with any Biometry method.

How works:

1. New option in settings, Enabled by default. Also there is a Legend at the end on this screen explaining what is store in KeyStore or KeyChain.
2. The App always store the last seed & birthday used.
3. The App don't store anything if you use an UFVK,
4. When you disable this option, the App immediately remove that info from the KeyStore/KeyChain.
5. IOS - When you install the App, it can recover the Seed & birthday if previously the App was installed before. In IOS this info is persistent.
6. Android - When you uninstall de App, the keyStore info is removed as well.
7. In the first screen, there is a new right menu option to recover the seed & birthday from the device.

We have two use cases to Store the recovery info (seed & birthday):

1. Really Safe: require active Biometrics method in the device: any for IOS [Keychain Secure Enclave] and strong (level 3) for Android [RSA].
2. Safe: no active Biometrics method in the device: IOS [Keychain] and Android (AES & CBC).