IVGCVSW-2232 Pack/Stack operator support in Tensorflow Parser

* Parser support and unit tests added for Stack opertor in TfParser


Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: I243b33fda2762180ef880458e760a54fde64f3d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ce9c42..e5876db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -710,6 +710,7 @@
             src/armnnTfParser/test/TestMultiInputsOutputs.cpp
             src/armnnTfParser/test/Split.cpp
             src/armnnTfParser/test/Squeeze.cpp
+            src/armnnTfParser/test/Stack.cpp
             src/armnnTfParser/test/Sub.cpp
             src/armnnTfParser/test/StridedSlice.cpp
             )