* Avoid SQLCipher key derivation by manually providing the generated as a raw key: this needs a series of DB re-key operations, performed as part of a 'dummy' DB migration
* Set key generation length to 32 bytes in `RandomSecretPassphraseProvider`.
* Use `ClientSecret` for handling the keys for SQLCipher. Move `ClientSecret` to `:libraries:androidutils` so it's shared.