feat(cat-voices): keychain and session

[dtscalac]

Description

Adds support for keychain which stores the seed phrase and updates session bloc to lock/unlock the session.

Next PRs will:

• add support for lock/unlock
• add support for session expiration (currently once unlocked it stays unlocked)

Clicking on these links will put the application in different states with mocked data:

  /// Temporary implementation for testing purposes.
  User get _dummyUser => const User(name: 'Account');

  /// Temporary implementation for testing purposes.
  SeedPhrase get _dummySeedPhrase => SeedPhrase.fromMnemonic(
        'few loyal swift champion rug peace dinosaur'
        ' erase bacon tone install universe',
      );

  /// Temporary implementation for testing purposes.
  LockFactor get _dummyUnlockFactor => const PasswordLockFactor('Test1234');

Related Issue(s)

Refers #813

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 292/292}$ | ${\color{red}Fail: 0/292}$ |

[damian-molinski]

LGTM!