Get all Bookings for a Spot based on the Spot's id

[xShirokuma]

Return all the bookings for a spot specified by id.

• An authenticated user is required for a successful response
• Seed data exists in the database for bookings to be returned.
• Successful response includes only bookings for the specified spot
• If you are NOT the owner of the spot, booking data returned includes the
  spotId, startDate, and endDate for each booking
• If you ARE the owner of the spot, booking data returned includes the id
spotId, userId, startDate, endDate, createdAt, and updatedAt for
  each booking
• If you ARE the owner of the spot, booking data returns associated data for
  User, including the id, firstName, and lastName
• Error response with status 404 is given when a spot does not exist with
  the provided id