Update beatmap related DTOs following new schema changes

[hburn7]

Update Beatmap DTOs

Overview

After updating the beatmap-related schemas, implement new DTOs and alter existing ones to reflect these changes.

Dependencies

• Store additional beatmap data #582

Tasks

• Remove artist and songTitle from BeatmapDTO
• Create BeatmapSetDTO and BeatmapSetCompactDTO
  • BeatmapSetDTO includes all child BeatmapDTOs (compact does not)
  • BeatmapSetDTO should inherit from BeatmapSetCompactDTO
  • BeatmapSetCompactDTO needs PlayerCompactDTO labeled Owner
• Create BeatmapAttributesDTO which excludes fields like Id, Created, etc.
• Update BeatmapDTO
  • Include BeatmapAttributesDTO
  • Include PlayerCompactDTO[] for any owners of the map