Improve event detail CRUDs.

1.

GET /api/event/<id>/expanded_search_view

Provides all the details required for the expanded search. Including an auto-fetch of the first organizer's details, numOrganizers, and event description.

2.

EventParticipantView now contains the organizer rating also.
(/api/event/<id>/participants/<participant_type>)

This CRUD should be used for the event details page.

3.

EventSearchView - now has eventRating. So the rating can now be displayed for past events.