Added a new endpoint for reservations and new fields in events, ticket_types and sessions APIs.

New endpoint for reservations


## Added
- New **Sessions** API:
	- `GET /v2/zoom_events/events/{eventId}/sessions/{sessionId}/reservations`

## Enhancements
- New `type` request field in the following  **Sessions** API:
	- `PATCH /v2/zoom_events/events/{eventId}/sessions/{sessionId}`
- New `host_id` response field in the following  **Events** API:
	- `GET /v2/zoom_events/events/{eventId}`
- New `attendance_type` request field in the following  **Ticket Types** API:
	- `POST /v2/zoom_events/events/{eventId}/ticket_types`
