Config: Support encryption keys

[sync-by-unito]

lib/src/configuration.dart

// /// The key used to encrypt the entire [Realm].
// ///
// /// A full 64byte (512bit) key for AES-256 encryption.
// /// Once set, must be specified each time the file is used.
// final List? encryptionKey;

[victor-marino]

Hi.

Is there any timeframe to support encryption?

Once it's implemented, I assume we will be able to generate a random key, encrypt the realm with that key, and then store the key securely on-device using something like flutter_secure_storage, right?

This would allow us to protect the encryption key using biometrics and create a seamless flow for the user.