IVGCVSW-6509 Front End + Reference Workload implementation

Subtask of story: IVGCVSW-6164 Add a Pooling3d FrontEnd and Ref Implementation

* Add front end
* Add reference workload
* Add corresponding unit tests

Change-Id: Icce4146dd0a06a1da46a2def00a82d343e171750
Signed-off-by: Tamas Nyiri <tamas.nyiri@arm.com>
diff --git a/include/armnn/Types.hpp b/include/armnn/Types.hpp
index 72c59d9..b5a4266 100644
--- a/include/armnn/Types.hpp
+++ b/include/armnn/Types.hpp
@@ -435,6 +435,7 @@
     X(UnidirectionalSequenceLstm) \
     X(ChannelShuffle) \
     X(Convolution3d) \
+    X(Pooling3d) \
 
 // New layers should be added at last to minimize instability.