Get details for a Spot from an id

[ChristoGrab]

Returns the details of a spot specified by its id.

• Successful response includes data only for the specified spot
• Spot data returned includes the id, ownerId, address, city,
  state, country, lat, lng, name, description, price, createdAt,
  and updatedAt
• Spot data returns aggregate data for numReviews and avgStarRating
• Spot data returns associated data for SpotImages, an array of image
  data including the id, url, and preview
• Spot data returns associated data for Owner, including the id,
  firstName, and lastName
• Error response with status 404 is given when a spot does not exist with
  the provided id