Added support for images using the filesystem as storage.

Api/Controllers/EventController.cs

Api/Controllers/RestaurantController.cs

Api/Controllers/ReviewController.cs

Api/Controllers/UserController.cs

Api/Program.cs

BusinessLayer/DTOs/Image/ImageDTO.cs

BusinessLayer/DTOs/Image/ImageUploadDTO.cs

BusinessLayer/Services/ImageService/IImageService.cs

BusinessLayer/Services/ImageService/ImageService.cs

BusinessLayer/Utils/Enums/ImageType.cs

BusinessLayer/Utils/Enums/OwnerEntityType.cs

DAL/Constants/Paths.cs

DAL/DAL.csproj

DAL/ImagePersistence/ImageStorage/FileSystemImageStorage.cs

DAL/ImagePersistence/ImageStorage/IImageStorage.cs

DAL/ImagePersistence/Model/BaseImagePathData.cs

DAL/ImagePersistence/Model/GenericImagePathData.cs

DAL/ImagePersistence/Model/ImageStorageData.cs

DAL/ImagePersistence/Model/LoadedImageData.cs

DAL/ImagePersistence/Model/RollbackEntry.cs