Add tests for authorize endpoint; update mocks and traits

[Mehrn0ush]

• Implemented comprehensive tests for the /authorize endpoint in src/endpoints/authorize.rs, covering scenarios such as:

  • Invalid client IDs
  • Invalid PKCE parameters
  • Unauthenticated user redirection to login
  • Authenticated users with valid and invalid scopes

• Updated MockSessionManager in mock.rs:

  • Added an add_session async method to facilitate session management in tests.

• Modified trait definitions in authentication.rs:

  • Added Send + Sync bounds to UserAuthenticator and SessionManager traits to ensure compatibility with Actix Web's data extraction requirements.

• Adjusted tests to ensure proper type casting and handling of async functions:

  • Cast Arc<MockUserAuthenticator> and Arc<MockSessionManager> to Arc<dyn UserAuthenticator> and Arc<dyn SessionManager> when adding to app_data.
  • Awaited async methods like add_session where necessary.

• Ensured all tests pass successfully after the changes.