IVGCVSW-2557 Ref Workload Implementation for Detection PostProcess

 * implementation of DetectionPostProcessQueueDescriptor validate
 * add Uint8ToFloat32Workload
 * add implementation of Detection PostProcess functionalities
 * add ref workload implemenentation for float and uint8
 * add layer support for Detection PostProcess in ref
 * unit tests

Change-Id: I650461f49edbb3c533d68ef8700377af51bc3592
diff --git a/src/backends/backendsCommon/WorkloadData.hpp b/src/backends/backendsCommon/WorkloadData.hpp
index e44eba7..09f5647 100644
--- a/src/backends/backendsCommon/WorkloadData.hpp
+++ b/src/backends/backendsCommon/WorkloadData.hpp
@@ -171,6 +171,13 @@
 
 struct DetectionPostProcessQueueDescriptor : QueueDescriptorWithParameters<DetectionPostProcessDescriptor>
 {
+    DetectionPostProcessQueueDescriptor()
+        : m_Anchors(nullptr)
+    {
+    }
+
+    const ConstCpuTensorHandle* m_Anchors;
+
     void Validate(const WorkloadInfo& workloadInfo) const;
 };