IVGCVSW-3824 Implement Float 16 Encoder and Decoder

* Implement Float 16 Encoder and Decoder
* Add Stack Float 16 layer and create workload tests

Signed-off-by: Matthew Jackson <matthew.jackson@arm.com>
Change-Id: Ice4678226f4d22c06ebcc6db3052d42ce0c1bd67
diff --git a/src/backends/backendsCommon/test/CMakeLists.txt b/src/backends/backendsCommon/test/CMakeLists.txt
index 49604b0..e46d481 100644
--- a/src/backends/backendsCommon/test/CMakeLists.txt
+++ b/src/backends/backendsCommon/test/CMakeLists.txt
@@ -113,6 +113,7 @@
     layerTests/SpaceToDepthTestImpl.hpp
     layerTests/SplitterTestImpl.cpp
     layerTests/SplitterTestImpl.hpp
+    layerTests/StackTestImpl.cpp
     layerTests/StackTestImpl.hpp
     layerTests/StridedSliceTestImpl.cpp
     layerTests/StridedSliceTestImpl.hpp