Add Query Filters to Get All Events

[j1jlee]

Add Query Filters to Get All Events

Return events filtered by query parameters.

• Query parameters are accepted for page, size, name, type and
  startDate
• Default values are provided for the page and size parameters
• Successful response includes only events in the database that meet the
  specified query parameters criteria
• Event data returned includes the id, groupId, venueId, name,
  type, startDate, endDate, and previewImage
• Event data returned includes aggregate data for numAttending
• Event data returned includes associated Group data, including id,
  name, city, and state
• Event data returned includes associated Venue data, if any, including
  id, city, and state
• Successful response includes the page and size of the returned payload
• Error response with status 400 is given when query parameter validations
  for the page, size, name, type or startDate are violated