* Correct google calendar test name
* Rewrite calendar component
* Save component in hass.data.
* Rename device_state_attributes to state_attributes.
* Remove offset attribute from base state_attributes.
* Extract offset helpers to calendar component.
* Clean imports.
* Remove stale constants.
* Remove name and add async_get_events.
* Add normalize_event helper function. Copied from #21495.
* Add event property to base entity.
* Use event property for calendar state.
* Ensure event start and end.
* Remove entity init.
* Add comment about event data class.
* Temporary keep old start and end datetime format.
* Convert demo calendar
* Convert google calendar
* Convert google calendar.
* Clean up google component.
* Keep offset feature by using offset helpers.
* Convert caldav calendar
* Clean up caldav calendar.
* Update caldav cal on addition.
* Bring back offset to caldav calendar.
* Copy caldav event on update.
* Convert todoist calendar
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