IVGCVSW-2555 Add no-op implementation for Detection PostProcess

 * Added DetectionPostProcessQueueDescriptor to WorkloadData
 * Added CreateDetectionPostProcess function in WorkloadFactory.hpp
 * Added stub implementation of the CreateDetectionPostProcess
in workload factories
 * Added DetectionPostProcessLayer stub implementation
 * Added AddDetectionPostProcessLayer to Network
 * Added IsDetectionPostProcessSupported to LayerSupportBase

Change-Id: Ifc071b3b6b12877c997bdcc43d769c8f891d5c6c
diff --git a/src/backends/reference/RefWorkloadFactory.hpp b/src/backends/reference/RefWorkloadFactory.hpp
index 79e73a2..211f93b 100644
--- a/src/backends/reference/RefWorkloadFactory.hpp
+++ b/src/backends/reference/RefWorkloadFactory.hpp
@@ -87,6 +87,9 @@
     std::unique_ptr<IWorkload> CreateDepthwiseConvolution2d(const DepthwiseConvolution2dQueueDescriptor& descriptor,
                                                             const WorkloadInfo& info) const override;
 
+    std::unique_ptr<IWorkload> CreateDetectionPostProcess(const DetectionPostProcessQueueDescriptor& descriptor,
+                                                          const WorkloadInfo& info) const override;
+
     std::unique_ptr<IWorkload> CreateNormalization(const NormalizationQueueDescriptor& descriptor,
                                                    const WorkloadInfo& info) const override;