Refactor namespaces from `DigitalData.Core.DTO` to `DigitalData.Core.Abstraction.Application.DTO` in multiple controllers to adopt a new abstraction layer. Update `DigitalData.Core.API` package from version `2.2.0` to `2.2.1` and add `DigitalData.Core.Abstraction.Application` package with version `1.0.0`. Add `[Obsolete("Use MediatR")]` attribute to several controllers to encourage transitioning to MediatR for request handling.
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