Add login and logout event publishing to Cloud class

[ludeeus]

No description provided.

[Copilot]

Pull request overview

This PR adds event publishing for login and logout operations in the Cloud class, enabling external components to subscribe to and react to authentication state changes.

• Adds LOGIN and LOGOUT event types to the CloudEventType enum
• Publishes LOGIN events after successful login() and login_verify_totp() calls
• Publishes a LOGOUT event at the start of the logout() method
• Refactors CloudEvent base class to make type a required instance field, allowing direct instantiation with specific event types
• Updates existing event subclasses (RelayerConnectedEvent, RelayerDisconnectedEvent) to use field(init=False) for the type field

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
hass_nabucasa/events/types.py	Adds LOGIN and LOGOUT event types; refactors CloudEvent to make type a required instance field; updates RelayerConnectedEvent and RelayerDisconnectedEvent to use field(init=False) for type
hass_nabucasa/init.py	Adds event publishing in login(), login_verify_totp(), and logout() methods
tests/events/snapshots/test_bus.ambr	Updates snapshot to reflect new field ordering in dataclass repr (type before timestamp)

[klejejs]

🚀